The trick of being majority beside controlling legislature processes is that you pay for consequences of what you do.
Out of Congress chamber, the bill has become pure and 100% Democrat bill. What they try to do in Senate now is to pull as many GOP as possible over to join them, not only for passing the bill but more importantly they can claim this is bipartisan effort. This is very very important to them.
Because down deep, most of Democrats including Obama knows the bailout bill will likely fail at the end. Once that happens, they can share the blame with GOP in 2010 election. Otherwise, the blame will fall squarely on OB and Democrats, big time. It may be 1996 scenario all over again.