-----
By his poker buddies' accounts, Obama is careful and focused. He's not easily distracted and doesn't give away his intentions unless it's to his advantage. He's not prone to taking risky chances, preferring to play it safe. But he's also serious and competitive: When he plays, he plays to win.
-----
Obama, then a state senator, was a founding member of the group. He became known as a cautious player with a good poker face, someone who paid more attention to the game than to the chatter and laughter that accompanied it.
Obama studied the odds carefully, friends say. If he had strong cards, he'd play. If he didn't, he would fold rather than bet good money on the chance the right card would show up when he needed it.
That reputation meant that he often succeeded when he decided to bluff.
"When Barack stayed in, you pretty much figured he's got a good hand," said Larry Walsh, a former senator.
http://www.cbsnews.com/stories/2007/09/24/politics/main3291299.shtml