The New York Times has an interesting article about John McCain getting back to his roots. I thought this was interesting section.
Mr. McCain, who did not respond to a request for an interview, told advisers the day after he lost to Barack Obama that he intended to seek a fifth term in the Senate. Yet he is facing a threatened primary challenge from J.D. Hayworth, a conservative talk show host and former Republican member of Congress, who said he was encouraged by polls that showed Mr. McCain was vulnerable.
“The question that people are asking is this,” Mr. Hayworth said in an interview. “Do we want to send John McCain back to the United States Senate again, or is it time to change to a clear, consistent, common-sense Republican?”
Notice that McCain doesn't return the NYT calls, buy Hayworth does? Now that's a switch. It's also clearly an indication that both camps think that McCain is vulnerable.