Tea Party candidates are fighting an uphill battle in all three    U.S. Senate contests, which could be vital to Republican hopes    of picking up the six seats they need to recapture control of    the chamber from Democrats in November.  
    Idaho, Arkansas and Pennsylvania also will hold primaries on    the campaign's biggest day of voting so far.  
    The most closely watched contest is in Kentucky, where    Republican Senate leader Mitch McConnell is a heavy favorite to    beat Tea Party challenger Matt Bevin, setting up one of    November's top Senate races against Democrat Alison Lundergan    Grimes.  
    Republican Party leaders, determined to avoid the sort of    divisive primaries that helped cost them winnable Senate races    in 2010 and 2012, have been more proactive this year in backing    mainstream candidates they think can win in November.  
    The effort has paid off so far with wins by    establishment-backed candidates in North Carolina and Texas    Senate primaries.  
    This year, McConnell was a top target of Tea Party groups, but    polls show him with a comfortable double-digit lead. Bevin    attacked McConnell's long tenure in Washington and argued he    had not done enough to fight spending and President Barack    Obama's agenda.  
    But McConnell and his allies pummeled Bevin for his    inexperience, and Bevin reinforced those claims with his own    campaign trail missteps, including an appearance at a rally    promoting cockfighting. Bevin said he thought it was a rally in    support of states' rights.  
    "McConnell made it very clear early on that he and Republicans    were going to take on the Tea Party, and they have been very    aggressive," said Stephen Voss, a political scientist at the    University of Kentucky.  
    A crowded Senate primary field in Georgia makes a July 22    runoff likely between the top two finishers on Tuesday for the    right to face off against Democrat Michelle Nunn in November.  
    The most conservative Tea Party candidates in Georgia are not    among the leaders in recent polls, with businessman David    Perdue, U.S. Representative Jack Kingston and former Georgia    Secretary of State Karen Handel fighting for the top spots.  
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Tea Party faces uphill battle in Republican primaries