No, this doesn't have anything to do with the fact that Dana Loesch voted for Mitt Romney in the 2008 GOP primary and said that she liked his individual mandate before realizing that branding herself as a "goth tea party rebel" was more profitable. Why would you think that?
This has to do with Loesch's tea party refusing to support a conservative challenger to GOP establishment poster-boy Roy Blunt. If you recall, Loesch originally told Roy Blunt that if he didn't support the conservative challenger to Dede Scozzafava, Doug Hoffman, in the NY-23 election "...we will vote you out! We will come at you with so much heat, you won't even know how to handle it!"
Roy Blunt ignored Loesch while his conservative primary challenger Chuck Purgason did endorse Hoffman, but not only did Loesch not "come at Blunt with so much heat," her tea party (before she threw it under the bus) actually refused to sign on to a letter from 28 other Missouri tea parties stating that Roy Blunt was not a tea party candidate (they did, however, endorse Ed Martin in the MO-03 primary). At that time, the St. Louis tea party was the most influential in the state, and their support could have made a huge difference for Purgason. And given Roy Blunt's huge margin of victory over Robin Carnahan, it's likely that Purgason would have won the general election had he made it through the GOP primary. Instead, the tea party got Roy Blunt and acted surprised when he still liked earmarks.
And now Roy Blunt, much to the chagrin of tea party bloggers, has been elected over conservative challenger Ron Johnson for a key Senate position. Erick Erickson at Red State says it's a victory for K Street over the tea party. No doubt it was, and K Street has Dana Loesch, among others, to thank, despite her half-hearted tweets to the contrary. Of course, now that Loesch is supporting Roy Blunt's campaign chairperson in Missouri's 2nd district and has thrown the local tea party to the wolves, her sycophantic relationship with the same old GOP establishment can no longer be considered surprising.
By the way, if Loesch is so darn "principled," why hasn't she ever defending her boss Andrew Breitbart against Glenn Beck?
Update: Looks like Loesch gave Breitbart two sentences to mention the Beck thing today on her show.