Race tightens in projected U.S. Electoral College vote

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An election analysis conducted in the Reuters/Ipsos States of the Nation project shows that the race has tightened considerably over the past few weeks, with Republican presidential nominee Donald Trump projected to win Florida, an essential battleground state, if the election were held today.

The project, which is based on a weekly tracking poll of more than 15,000 Americans, shows that the 2016 presidential race could end in a photo finish on Nov. 8, with the major-party candidates running nearly even in the Electoral College, the body that ultimately selects the president.

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The States of the Nation project, which delivers a weekly tally of support for the candidates in every state, shows that the race has tightened in several traditional battlegrounds. Pennsylvania has been moved from a likely win for Democratic presidential nominee Hillary Clinton to a tossup; Ohio has been moved from a tossup to a likely win for Clinton. And Florida is now considered a likely win for the Republican nominee, with 50 percent support for Trump to 46 percent support for Clinton.

If the election were held today, the project estimates that Clinton has a 60 percent chance of winning by 18 electoral votes. Last week, the project estimated that Clinton had a 83 percent chance of winning the election.

In a separate national Reuters/Ipsos tracking poll, Clinton continues to lead Trump by 4 percentage points, and her recent bout with pneumonia doesn't appear to have scared away her supporters.

The national Sept. 9-15 tracking poll showed that 42 percent of likely voters supported Clinton while 38 percent backed Trump. Clinton, who has mostly led Trump in the poll since the Democratic and Republican national conventions ended in July, regained the advantage this week after her lead briefly faded in late August.

Clinton has an advantage among minorities, women, people who make more than $75,000 a year, and those with moderate political leanings. Trump has an advantage with whites, men, avid churchgoers, and people who are nearing retirement age.

RELATED: Clinton overheats at 9/11 event with pneumonia

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NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton arrives with an unidentified woman at the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton left a September 11 Commemoration Ceremony early after feeling overheated and went to her daughter's house to rest. (Photo by Justin Sullivan/Getty Images)
TOPSHOT - Democratic presidential nominee Hillary Clinton leaves a memorial service at the National 9/11 Memorial September 11, 2016 in New York. The United States on Sunday commemorated the 15th anniversary of the 9/11 attacks. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton, New York Mayor Bill de Blasio (R) and U.S. Senator Chuck Schumer attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton attends the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton attends ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton leaves ceremonies marking the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton arrives for ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton and New York Mayor Bill de Blasio (R) attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton, New York Mayor Bill de Blasio (R) and U.S. Senator Chuck Schumer attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
Democratic presidential nominee Hillary Clinton leaves a memorial service at the National 9/11 Memorial September 11, 2016 in New York. The United States on Sunday commemorated the 15th anniversary of the 9/11 attacks. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton (C) attends the September 11 Commemoration Ceremony with New York city mayor Bill de Blasio (R) and U.S. Sen. Chuck Schumer (D-NY) (L) at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
Democratic presidential candidate Hillary Clinton arrives to attend a ceremony at the National September 11 Memorial, in New York, Sunday, Sept. 11, 2016, on the 15th anniversary of the Sept. 11 attacks. (AP Photo/Andrew Harnik)
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton leaves the home of her daughter Chelsea Clinton on September 11, 2016 in New York City. Hillary Clinton left a September 11 Commemoration Ceremony early after feeling overheated and went to her daughter's house to rest. (Photo by Justin Sullivan/Getty Images)
US Democratic presidential nominee Hillary Clinton leaves her daughter's apartment building after resting on September 11, 2016 in New York. Clinton departed from a remembrance ceremony on the 15th anniversary of the 9/11 attacks after feeling 'overheated,' but was later doing 'much better,' her campaign said. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton leaves her daughter Chelsea's home in New York, New York, United States September 11, 2016, after Clinton left ceremonies commemorating the 15th anniversary of the September 11 attacks feeling "overheated." REUTERS/Brian Snyder TPX IMAGES OF THE DAY
U.S. Democratic presidential candidate Hillary Clinton leaves ceremonies marking the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder TPX IMAGES OF THE DAY
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton leaves the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
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LITTLE CONCERN OVER CANDIDATES' HEALTH

Overall, Americans appear to be relatively uninspired by their choices for president with less than eight weeks to go before the election. One out of every five likely voters said they do not support Clinton or Trump for president. In comparison, about one out of every 10 likely voters wouldn't support Obama or Republican challenger Mitt Romney at a similar point in the 2012 presidential campaign.

Respondents took the survey after video surfaced of Clinton nearly collapsing at a Sept. 11 memorial in New York on Sunday. Her campaign later said she had a non-contagious, bacterial form of pneumonia.

The video sparked a renewed discussion about the health of both candidates. Trump, 70, would be the oldest president to take office, while Clinton, 68, would be the second oldest.

Clinton and Trump candidates have since released details of their personal health. Clinton's doctors said her physical exam was normal, apart from the pneumonia, and that she was in excellent mental condition. Trump released a note from his doctor saying that he was in "excellent physical health."

Americans do not appear to be overly concerned with the health of either candidate. According to a separate question in the poll conducted this week, most American adults said the issue would make "no difference" to how they voted.

A negligible percentage of Clinton supporters said concerns about her health made them "less likely" to vote for her.

Clinton led all candidates in a four-way poll of likely voters that included Gary Johnson of the Libertarian Party and Jill Stein of the Green Party. Seven percent of respondents supported Johnson, and 2 percent backed Stein.

The Reuters/Ipsos poll is conducted online in English in all 50 states. The latest horserace poll surveyed 1,579 likely voters over the past week. The question on the candidates' health surveyed 1,179 American adults from Sept. 12-16. Both polls had a credibility interval, a measure of accuracy, of 3 percentage points.

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Mike Rasmussen, wearing a t-shirt opposing Democratic presidential candidate Hillary Clinton, pauses for photos before the arrival of Republican presidential candidate, Sen. Ted Cruz, R-Texas, at a bar Friday, Jan. 29, 2016, in Ringsted, Iowa. (AP Photo/Jae C. Hong)
A new batch of anti-Hillary-Clinton buttons popped up outside Donald Trump's rally tonight: https://t.co/VxKkxSS2We
Going live soon for @HuffPostPol w Trump supporters in Wisconsin -shirts say "Hillary sucks but not like Monica" https://t.co/syRNa7iH2g
T-shirts on sale outside Trump event in RI. Lines to buy them. #2016 https://t.co/fhnN4sZDAP
https://t.co/wYuBRk7nPd https://t.co/lkutjuwU70
Most coveted anti-Trump t-shirt at #tdp16: https://t.co/LWcERN9TPn
@trumpshirts Perfect anti-Trump T-shirt -> https://t.co/YkJoAq22m3 … https://t.co/2Xxaf4idu3
Back and front of Hillary-Monica t-shirt outside Trump rally. Vendor told me they sell it in size "sexy" too https://t.co/tBgQIzDwXf
Awesome RT @FastCompany: American Apparel taunts Trump with “Make America Gay Again” hats https://t.co/PYqpzXXMBs https://t.co/drIYOmhIu3
Trump card: Strand Book Store is selling ‘Make America Read Again’ hats http://t.co/iAHMKhXYJS http://t.co/fbGFKzd4G1
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National polls have produced varying measurements of support during the 2016 campaign for Clinton and Trump. The differences are partly due to the fact that some polls, like Reuters/Ipsos, try to include only likely voters, while others include all registered voters. The Reuters/Ipsos tracking poll gathers responses every day and reports results twice a week, so it often detects trends in sentiment before most other polls.

Polling aggregators, which calculate averages of major polls, have shown that Clinton's lead over Trump has been shrinking this month. The most recent individual polls put Clinton's advantage at 1 or 2 percentage points.

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