Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE has a 79 percent change of winning the White House in a general election matchup against Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE, according to political analysis website FiveThirtyEight.

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"We're kind of at halftime of the election right now, and she's taking a 7-point, maybe 10-point lead into halftime," Nate Silver, founder of the site, told ABC's "Good Morning America" on Wednesday.

"There's a lot of football left to be played, but she's ahead in almost every poll, every swing state, every national poll."

Clinton, the presumptive Democratic nominee, leads Trump, her Republican counterpart, by 6 points in a RealClearPolitics average of polls. She led Trump in all 18 national polls conducted so far in June that RCP logged.

"Both have a lot of room to grow ... but the last candidate to blow a lead this large was in '88, when Dukakis had a big lead coming out of the spring and summer and wound up losing of course to Bush," Silver said.

"One big lesson of this campaign is don't try to outthink the polls. Don't try to outthink the American public. Trump has never been ahead of Clinton in the general election campaign," he added.

"He did a great job of appealing to the 40 percent of the GOP he had to win in the primary, but that's a lot different than winning 51 percent of 100 percent."