Barack Obama has been getting increasingly involved in state races but he hasn’t always been successful: He couldn’t to keep Andrew Romanoff and Joe Sestak from challenging Democratic senators in Colorado and Pennsylvania, he did not persuade Roy Cooper to run for Senate and there is little indication for now that David Paterson was marked by the president’s message that he should retire. In other contests, however, Obama’s intervention has proven decisive. Kirsten Gillibrand owes a lot to Oba

Source:Obama’s involvement & Lawton’s exit shake up Wisconsin