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 TrumpStates slashed 4,400 environmental agency jobs in past decade: study Biden hammers Trump over video of world leaders mocking him Iran building hidden arsenal of short-range ballistic missiles in Iraq: report MORE formally accepting his party’s presidential nomination.

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Hillary ClintonHillary Diane Rodham ClintonThree legal scholars say Trump should be impeached; one thinks otherwise Report: Barr attorney can't provide evidence Trump was set up by DOJ Jayapal pushes back on Gaetz's questioning of impeachment witness donations to Democrats 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 SandersGabbard moves to New Hampshire ahead of primary Sanders to join youth climate strikers in Iowa Saagar Enjeti unpacks why Kamala Harris's campaign didn't work MORE supporters after a tough primary fight.

Some third-party candidates, including Libertarian nominee Gary JohnsonGary Earl JohnsonThe Trump strategy: Dare the Democrats to win Trump challenger: 'All bets are off' if I win New Hampshire primary Scaramucci assembling team of former Cabinet members to speak out against Trump 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.