Pelosi's Choice

Apparently Rep. Peter DeFazio says that Joe Biden told House Democrats that Barack Obama was willing to invoke the 14th Amendment option if "all else failed." If that's really true, why shouldn't Nancy Pelosi make all else fail? From what I've heard, she has the power to sink this deal if she wants to. Obama may not prefer a constitutional crisis to a deal, though sensibly he prefers a constitutional crisis to an economic catastrophe. But I think Nancy Pelosi might prefer the constitutional showdown, right? The vote is in the middle of being held, and it sits at 167-101 in favor as I'm writing, but there are a lot of Democratic votes that haven't come in yet. It'll be interesting to see what happens if this does indeed fail.