She makes her 2010 campaign debut in Milwaukee today by hosting three fund-raisers for struggling Democratic Wisconsin senator Russ Feingold. “This isn’t something I do very often,” she will say, according to excerpts released by the White House. "In fact, I haven’t really done it since a little campaign you might remember a couple of years ago. As a self-described mom-in-chief, my first priority in the White House has been making sure that my girls are happy and healthy and adjusting to this new life.“ She will hit a similar note tomorrow, when she goes to Colorado to campaign for Senate candidate Michael Bennet. [Caucus/NYT]