So much for conservatives uniting ahead of Alabama and Mississippi. Newt Gingrich's team just came out with what I believe is its first sharp hit against Rick Santorum of the campaign, a video montage of the former Pennsylvania senator talking earmarks, endorsing Mitt Romney in the 2008 presidential race and taking "one for the team," as he memorably put it in the final GOP debate in Arizona last month. If the lines of attack seem familiar, it's because Team Romney - the campaign Gingrich has said he wants to thwart - has been using them against Santorum for weeks. It's...