Christine O’Donnell won a remarkable upset in Tuesday’s Delaware GOP Senate primary. But the Tea Party movement and key supporters such as Sarah Palin and Sen. Jim DeMint, R-S.C., may ultimately regret it. Perhaps not in the short term. Yes, O’Donnell faces even longer odds in the general election, and “Republicans’ road to 51 just got a lot harder according to Realclearpolitics.com’s Sean Trende says. But having a Senate majority in 2011 may not be that important by itself. Republicans will likely control the House and Barack Obama will still hold the White House.