McCain Vs. Hayworth: A Scene From the GOP Civil War?

Ed Kilgore at The New Republic has a look at this year's "Republican Civil War":

All across the country, Republicans are fantasizing about a gigantic electoral tide that will sweep out deeply entrenched Democratic incumbents this November. In their telling, this deep-red surge will be so forceful as to dislodge even legislators who don’t look vulnerable now, securing GOP control of both houses of Congress.

But could this scenario really come to pass? That will depend, in part, on