Michael Barone's piece today is "must" reading, and contains thought-provoking observations like: "Mr. McCain's talk-show critics call for the Huckabee and Romney constituencies to unite. But that's mixing oil and water. Mr. Romney was winning about 10 percent in south Georgia counties while Mr. Huckabee was winning not much more in upscale Buckhead and Sandy Spring. Mr. McCain was competitive on both kinds of turf." .. And: "Democrats' strategies haven't worked either. John Edwards's faux populism reduced him from 45 percent in the South Carolina primary (his native state) in 2004 to 17 percent in 2008. Hillary Clinton's strategy of winning quick victories in Iowa and New Hampshire avoided total failure only by a pre-New Hampshire election day dose of tears." Read the whole thing, as they say.