An AP story up now says:

WASHINGTON — Massachusetts Gov. Mitt Romney said Wednesday he’s filing papers to form an exploratory committee to run for president in 2008. The filing will make Romney the third Republican to take the step, after Arizona Sen. John McCain and former New York Mayor Rudy Giuliani. Unless I’m missing something, Sam Brownback does have an exploratory committee. He’s a long longshot, but he does make that third Republican sentence false — especially since he may be a little bit of a headache for one or more of the others.