Kentucky Sen. Rand Paul is making an 11th hour plunge into the    North Carolina Senate race, aiming to boost his preferred    candidate and block the GOP establishments favorite, state    House Speaker Thom Tillis, from scoring a clean win in    Tuesdays primary.  
    The Kentucky Republican and potential presidential candidate    said in an interview that he will stump on Monday for    Republican Greg Brannon, a libertarian-minded candidate who is    trying to ride a tea party wave into a runoff against Tillis,    who is backed by the party establishment and is reportedly expected to receive the    endorsement of Jeb Bush. Tillis is looking to avoid a runoff in    North Carolina and quickly unite the party in the critical    Senate race against Democratic Sen. Kay Hagan.  
    Tillis needs to eclipse 40 percent in the primary to win    outright, and several recent polls have him on the cusp, making    Pauls move potentially a consequential one. If Tillis falls    short, he would face a two-month runoff, draining his resources    ahead of the general election.  
    (QUIZ: Do you know Rand Paul?)  
    Paul endorsed Brannon in October, but Brannon has hit a    rough patch with legal problems in recent    months and the senator hadnt put his muscle behind the fellow    physician since. Until now.  
    I have decided today Im going Monday to campaign for Greg    Brannon in North Carolina, Paul said in the Capitol Wednesday.    I think its pretty close there actually, and theres a chance    we can help him enough to push him over the top.  
    BIG NEWS! Brannon later tweeted to promote the Charlotte    rally with Paul.  
    The move by Paul is the latest effort by 2016 presidential    hopefuls to exert themselves in 2014 primary races at a time    when intra-party wars could jeopardize a prime GOP opportunity    to retake the Senate. Most of the presumed 2016 candidates are    either staying out of primary fights or taking a far more    measured approach, calculating the risks of putting their name    behind a candidate who could catch fire  or implode.  
    (PHOTOS: 10 tough Senate races    for Democrats)  
    But stumping alongside midterm candidates also gives them an    opportunity to build ties with Senate hopefuls, their fervent    supporters and big-dollar donors.  
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Paul to plunge into N.C. Senate race