First, it was Evangelical leaders warning McCain against picking Romney. Now, as Jonathan Martin notes, it's Huckabee who's making the warnings:

For the second consecutive day, Mike Huckabee made public statements suggesting John McCain ought not pick Mitt Romney as his running mate.

"I think there are better choices for Sen. McCain that have the approval of value voters," Huckabee said today on Fox News. Yesterday, he told CBS that many Republicans are "not necessarily comfortable" with Romney because of his changed positions.

At the same time, Huckabee's Michigan supporters met with McCain social conservative liaison Marlys Popma last night in Saginaw. Though ostensibly held to discuss how Huckabee's loyalists can help McCain, supporters of the former Arkansas governor also used the get-together to warn against tapping Romney, according to an attendee.

Geez, one wonders what they think of Tom Ridge. Which brings up a good point. If this was just about appealing to the social conservative sect, McCain could do a lot worse than Mitt Romney. There's Ridge and Joe Lieberman to name just the obvious choices.

As Martin also notes, this is about presidential politics. If Romney is on the ticket and McCain wins, Romney is immediately heir apparent in 2012 or 2016, cutting out Huckabee.

UPDATE: Huckabee on Fox News today: