Sen. Chuck Grassley got a little feisty this weekend, calling the president “stupid” on Twitter in response to Obama’s assertion last week that the Supreme Court would not take the “unprecedented, extraordinary step of overturning” his health-care law. The Republican from Iowa tweeted: “Constituents askd why i am not outraged at PresO attack on supreme court independence. Bcause Am ppl r not stupid as this x prof con law.” Harsh words, but the president may have gotten the last laugh. “Heads up, Sen. Grassley. I think a 6-year-old hijacked your account and is sending out foolish Tweets just to embarrass you!” campaign adviser David Axelrod quipped.