Political Party Pooper has an extensive post enumerating the multitude of reasons for passing the bill now. The salient point:
You’ve just taken nine months of our time stuffing this bratwurst into its casing. Are you really going to tell us that it was all for nothing, that Republicans were right all along? In the end, if you decide to walk away from this sausage, you lose.
That's the bottom line. The Democrats walk away at their own peril. President Obama has always said he'd sacrifice a second term to do what's right. Now he's sacrificing a second term while doing what's wrong. Wrong for everyone.