Sen. Harry Reid (D., Nev.) trails both of his highest-profile Republican challengers by wide margins. But in a hypothetical three-way race including a tea-party candidate, Reid could eke out a win:

From a Mason-Dixon/Las Vegas Review-Journal poll, via CNN:

Reid’s fortunes may be boosted by the presence of potential Tea Party-backed candidate John Ashijian, a businessman in Las Vegas who has no political experience. According to the poll, Reid would win a three-way race that included a Tea Party candidate, garnering 36 percent of the vote compared to 32 percent for a generic Republican. The Tea Party candidate registered 18 percent.