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 TrumpGOP congressman slams Trump over report that U.S. bombed former anti-ISIS coalition headquarters US to restore 'targeted assistance' to Central American countries after migration deal Trump says lawmakers should censure Schiff MORE formally accepting his party’s presidential nomination.

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Hillary ClintonHillary Diane Rodham ClintonGOP warns Graham letter to Pelosi on impeachment could 'backfire' Hillary Clinton praises former administration officials who testified before House as 'gutsy women' Third-quarter fundraising sets Sanders, Warren, Buttigieg apart 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 SandersOvernight Health Care — Presented by National Taxpayers Union — House Dems change drug pricing bill to address progressive concerns | Top Republican rejects Dem proposal on surprise medical bills | Vaping group launches Fox News ad blitz Democrats have reason to worry after the last presidential debate Krystal Ball on Sanders debate performance: 'He absolutely hit it out of the park' 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.