Even other Dems know he's a lightweight.
With colleagues in Congress quick to claim credit where it is due, word moves quickly when undue credit is claimed.
"If it happens once or twice, you let it go," said Sen. Christopher J. Dodd (D-Conn.), an Obama supporter. "If it becomes the mantra, then you go, 'Wait a minute.' "
Immigration is a case in point for Obama, but not the only one. In 2007, after the first comprehensive immigration bill had died, the senators were back at it, and again, Obama was notably absent, staffers and senators said. At one meeting, three key negotiators recalled, he entered late and raised a number of questions about the bill's employment verification system. Kennedy and Specter both rebuked him, saying that the issue had already been resolved and that he was coming late to the discussion. Kennedy dressed him down, according to witnesses, and Obama left shortly thereafter.
"Senator Obama came in late, brought up issues that had been hashed and rehashed," Specter recalled. "He didn't stay long."