Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s chances of winning the presidency have fallen sharply over the past week, though she still is the favorite, according to a Reuters/Ipsos Electoral College analysis released Saturday.

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The analysis estimates that if the election were held today, Clinton would have a 60 percent chance of winning. Last week, it found that she had an 83 percent chance.

The analysis is based on a weekly tracking poll of 15,000 Americans and breaks down the candidates’ standing in every state.

The new numbers have shifted the odds in several battleground states. Pennsylvania has gone from a likely win for Clinton to a toss-up, while Ohio has gone the other way, from a toss-up to a likely Clinton win.

Florida is considered a likely win for Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE, who leads Clinton in the state 50 to 46 percent.

The poll shows that Clinton leads Trump by four points nationally, 42 to 38 percent. Her average lead, according to RealClearPolitics's polling average, is 1.5 points.

The poll surveyed 1,579 likely voters from September 9-15. It has a credibility interval of 3 percentage points.