“I’ve always believed that it’s not an effective strategy to run against a president of your own party, unless you’ve been actively opposed to that president,” said David Axelrod, who was Obama’s top political strategist in his two presidential campaigns and a senior adviser in his White House. “You’re going to get tagged with it anyway.”
Particularly when running against said President is in direct contradiction to your own voting history.
[A] new issue of Congressional Quarterly brings fresh evidence that Senate Democrats have maintained a tight formation behind the president, even as his approval ratings have sunk. It analyzed the 120 Senate votes on which Obama has urged a “yes” or “no” this year, and found that the most vulnerable Democrats stood behind him a minimum of 96 percent of the time.
You end up pleasing nobody.