Though not widely reported, rumors slowly began circulating last month that former GOP presidential nominee John McCain may face a primary challenge in 2010 from former Congressman J.D. Hayworth. (Rep. Jeff Flake and Rep. John Shadegg were both likely candidates for the open seat if McCain were to win the presidency, but it appears unlikely either would challenge McCain.) McCain, of course, would be hard to beat. He garnered close to 54 percent of the vote in Arizona's general election. More importantly, he easily won the state's primary, garnering more than 47 percent of the vote (though exit polls show...