Race tightens in projected U.S. Electoral College vote

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.

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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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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