Who Wins the Flip-Flop Primary?

John McCain and Mitt Romney are calling each other flip-floppers in new online ads that mimic a cutting anti-John Kerry 2004 campaign commercial, the Post’s Michael Dobbs reports. The ads copy its use of the "Blue Danube" Waltz to mock each other's changing views on tax cuts—but the record shows that both hopefuls have vacillated on a range of issues key to GOP voters.

Romney has made shifts on abortion, gay rights, and gun control, but McCain prides himself as forthright—and might be vulnerable if his about-faces on taxes, the religious right, and immigration were better known to supporters. Some watchers say Mitt’s changes put his core convictions on the line, but Mac has fought harder to disguise his switches. (More flip flop stories.)