I guess Boss Hawg Haley Barbour realized he had about a snowball's chance in hell of winning the GOP nomination, much less the 2012 election, since he just announced he will not be a candidate in 2012.
Not that this should surprise you. I never expected him to run, because there are probably far too many skeletons in his closet and he's one of the best fundraisers the GOP has. He's set up a state network that was very effective in 2010, and will be best utilized by Republicans continuing to raise money behind the scenes.