Hillary Clinton has a huge lead over Donald Trump in one of the most consequential swing states

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Clinton Leads In Pennsylvania

A new poll released Thursday showed Hillary Clinton with a massive lead over Donald Trump in Pennsylvania — a state both candidates are zeroing in on.

The Suffolk University poll showed Clinton with a 9-point lead over Trump in the Keystone State as the Democratic National Convention takes place in Philadelphia. When Libertarian nominee Gary Johnson and Green Party nominee Jill Stein are included, Clinton's lead remains 9 points.

Knowing the importance of the battleground state, Trump and his running mate, Indiana Gov. Mike Pence, stopped in Scranton, Pennsylvania, Wednesday for a campaign event. After the DNC wraps up Thursday, Clinton will be holding rallies alongside her running mate, Sen. Tim Kaine of Virginia, in Philadelphia and Harrisburg on Friday and in Pittsburgh on Saturday.

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The poll was one of few that provided encouraging news for Clinton as Trump experienced a big bump after last week's Republican National Convention in Cleveland. The Republican nominee leads Clinton in the national average on RealClearPolitics by .9 points — his largest lead in the coveted polling average all cycle.

But in order to win in the fall, Trump will almost certainly need to flip Pennsylvania, Ohio, and Florida. from their 2012 blue results.

The poll also provided encouraging results for Democratic Senate nominee Katie McGinty, who is challenging Republican incumbent Pat Toomey. McGinty held a 7-point lead over Toomey in the poll, her largest lead over Toomey in any poll posted to RealClearPolitics.

The Suffolk poll has proven accurate in recent Pennsylvania Senate contests. The final Suffolk poll ahead of the 2010 election between Toomey and Democratic nominee Joe Sestak showed a 5-point advantage for the Pennsylvania Republican, who would go on to win by 2 points. In the final poll ahead of the 2010 Democratic primary, Suffolk predicted a 9-point upset for Sestak over longtime incumbent Sen. Arlen Specter. Sestak won by 8 points.

Suffolk polled 500 likely voters via live telephone interviews, and the margin of error was 4.4 points. It was conducted between Monday and Wednesday, right as the DNC was taking place in the state.

In the last Pennsylvania poll posted to RealClearPolitics, conducted by NBC News/The Wall Street Journal, Clinton was found to hold the same 9-point advantage over Trump.

See Hillary Clinton's surprise appearance at the DNC:

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Hillary Clinton and Barack Obama at the DNC
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Hillary Clinton and Barack Obama at the DNC
U.S. President Barack Obama (L) and Democratic presidential candidate Hillary Clinton wave to the crowd after the President spoke at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 27, 2016. REUTERS/Brian Snyder
Democratic presidential nominee Hillary Clinton hugs U.S. President Barack Obama as she arrives onstage at the end of his speech on the third night of the 2016 Democratic National Convention in Philadelphia, Pennsylvania, U.S., July 27, 2016. REUTERS/Jim Young 
Democratic presidential nominee Hillary Clinton hugs U.S. President Barack Obama as she arrives onstage at the end of his speech on the third night of the 2016 Democratic National Convention in Philadelphia, Pennsylvania, U.S., July 27, 2016. REUTERS/Jim Young
Democratic presidential nominee Hillary Clinton greets U.S. President Barack Obama as she arrives onstage at the end of his speech on the third night of the 2016 Democratic National Convention in Philadelphia, Pennsylvania, U.S., July 27, 2016. REUTERS/Jim Young
Democratic presidential nominee Hillary Clinton greets U.S. President Barack Obama as she arrives onstage at the end of his speech on the third night of the 2016 Democratic National Convention in Philadelphia, Pennsylvania, U.S., July 27, 2016. REUTERS/Jim Young
U.S. President Barack Obama and Democratic presidential nominee Hillary Clinton appear onstage together after his speech on the third night at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 27, 2016. REUTERS/Mark Kauzlarich
U.S. President Barack Obama and Democratic presidential nominee Hillary Clinton appear onstage together after his speech on the third night at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 27, 2016. REUTERS/Mike Segar
U.S. President Barack Obama and Democratic presidential nominee Hillary Clinton appear onstage together after his speech on the third night at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 27, 2016. REUTERS/Carlos Barria
Democratic presidential nominee Hillary Clinton joins U.S. President Barack Obama onstage after his remarks on the third night of the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 27, 2016. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY
U.S. President Barack Obama and Democratic presidential nominee Hillary Clinton appear onstage together after his speech on the third night at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 27, 2016. REUTERS/Mike Segar
U.S. President Barack Obama and Democratic presidential nominee Hillary Clinton appear onstage together after his speech on the third night at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 27, 2016. REUTERS/Mike Segar
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