Businessman Eugene Yu (R) has decided to drop out of Georgia's crowded Senate field and instead challenge Rep. John BarrowJohn Jenkins BarrowRepublican wins Georgia secretary of state runoff to replace Kemp The most important runoff election is one you probably never heard of Our democracy can’t afford to cut legal aid services from the budget MORE (D-Ga.).

Yu told a local TV station the news, which adds a dose of uncertainty into Barrow's race.


The switch crowds the GOP field vying to face Barrow and increases the chances the Republican primary will go to a runoff, since more candidates make it harder for any of them to win the 50 percent needed to avoid one.

Three other candidates are already running: 2012 candidate Rick Allen (R), 2010 nominee John Stone (R) and state Rep. Delvis Dutton (R).

Yu had failed to gain any traction in the race to replace retiring Sen. Saxby Chambliss (R-Ga.). He faced five better-known candidates, and most polls had found him with 1 percent or less of the vote.

Still, Yu has the ability to self-fund and spent nearly $450,000 of his own money on his abandoned Senate bid. The money could make him a serious player in the House race.

Barrow is a top GOP target — Mitt Romney won his district by a 12-point margin in 2012. But he's proven tough to beat in past years, and both Stone and Allen have struggled with fundraising so far in this election cycle. Republicans are hopeful they can field a strong candidate against Barrow this time around.