Google searches for 'third-party candidate' spike during GOP convention
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Google says searches for a "third-party candidate" rose 1,150 percent during this week’s Republican National Convention.

The four-day event in Cleveland ended Thursday with Donald TrumpDonald John TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller MORE formally accepting his party’s presidential nomination.

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Hillary ClintonHillary Diane Rodham ClintonGeorge Takei: US has hit a new low under Trump Democrats slam Puerto Rico governor over 'shameful' comments, back protesters Matt Gaetz ahead of Mueller hearing: 'We are going to reelect the president' MORE is slated to accept her party's nomination during the Democrats' convention next week in Philadelphia.

But both Clinton and Trump consistently score high unfavorable ratings in multiple polls.

Trump has also struggled with the Never Trump movement that vowed to oppose his nomination. But those Trump critics also faltered at efforts to attract a challenger.

Clinton could face difficulty winning over Bernie SandersBernie SandersBullock: I would not have endorsed health care for undocumented immigrants on debate stage Harris faces pressure to define policy proposals Biden campaign rips 'Medicare for All,' calls on Dems to protect Affordable Care Act MORE supporters after a tough primary fight.

Some third-party candidates, including Libertarian nominee Gary JohnsonGary Earl JohnsonAmash won't rule out Libertarian challenge to Trump Buzz grows Amash will challenge Trump as a Libertarian Potential GOP primary challenger: Trump's 'contempt for the American people' behind possible bid MORE and Green Party candidate Jill Stein, are also looking to gain traction.

A RealClearPolitics average of polls with all four candidates shows Clinton leading, with 40.9 percent, Trump second, with 37.3 percent, Johnson at 8.3 percent, and Stein with 4 percent.