Arizona Sen. John McCain, the Republicans' standard-bearer in 2008, is facing a surprisingly strong primary challenge from the right, evidence that even party leaders aren't safe from the swell of conservative activism heading into the 2010 midterm elections.
Mr. McCain hasn't faced a serious challenge since joining the U.S. Senate in 1987. But seven months ahead of the primary, he is using tough-guy tactics and calling in conservative chits to fend off J.D. Hayworth, an ex-congressman and radio host. Mr. Hayworth, who lost his House seat in 2006 and who is best known in Arizona for his opposition to illegal immigration, has seized the Tea Party mantel of low taxes and small government.
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