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 TrumpChelsea Clinton announces birth of third child Ukrainian officials and Giuliani are sharing back-channel campaign information: report Trump attacks 'the Squad' as 'racist group of troublemakers' MORE formally accepting his party’s presidential nomination.

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Hillary ClintonHillary Diane Rodham ClintonChelsea Clinton announces birth of third child Ukrainian officials and Giuliani are sharing back-channel campaign information: report A question for Robert Mueller 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 Sanders'Medicare for All': The hype v. Maryland's reality Biden says he supports paying campaign staff minimum wage Biden's lead narrows in early voting states: poll 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.