Hayworth, a former sportscaster who spent more than a decade in Congress before he was defeated in 2006 by Rep. Harry Mitchell (D), is a popular figure among grassroots conservatives -- a status McCain has never courted or achieved. McCain already faces a primary challenge from Chris Simcox, a founder of the Minutemen -- a leading anti-immigration group. While there is considerable resentment from some grassroots conservatives toward McCain, it's not clear that he is vulnerable to a primary challenge. McCain ended June with $4.65 million in the bank.
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