Statistician and data expert Nate Silver on Tuesday gave 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 a 44.5 percent chance of winning the general election — the GOP presidential nominee's highest odds to date.

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Clinton held a 55.5 percent chance of victory, according to Silver's FiveThirtyEight "Polls-plus" forecast, which shows what "polls, the economy and historical data tell us about Nov. 8."

On Wednesday, Trump's chances dropped slightly to 43.9 percent in the same election forecast, leaving Clinton at 56.1 percent.

The projection as of Wednesday shows Clinton winning 278.7 Electoral College votes and Trump winning 259.1.

Clinton is also favored to win the popular vote, but only by a small margin, 46.5 to 45.1 percent.

Trump would secure wins in several battleground states, according to the forecast, including Florida, Ohio and North Carolina.

The polls between both major parties' nominees have been tightening recently as the two candidates make their final push ahead of Election Day.

According to the RealClearPolitics average of polls, the Democratic nominee has just a 1.1-point lead over her Republican rival, 45 to 43.9 percent.

Polls in several battleground states have also showed the race tightening.