Why? To pull out all the stops, of course. To do everything possible to gain a "victory" on this issue. In true Chicagoland style, Barack Obama, most assuredly, stands ready to threaten dire political consequences to any Democrat who dares oppose him when the final vote is held. But, much more important that the threatened "sticks" will be the billions of dollars in "carrots" - the unspent "stimulus" money that Obama to particular states in exchange for Senators' votes.
Keep a watchful eye on the Democrats this week. Listen to what they say but be sure to keep tabs on their bank accounts.