Single-payer is obviously great but 1) the requisite tax increases are scary/cause cold feet due to sticker shock for voters and 2) industry comes down powerfully to bear on/threaten democratic govs/legislatures.
And it might be better in America to do a transition with the public option first anyway. That's why I'm pretty excited if cautiously optimistic about HRC's recent support for the public option. I think that's exactly how to start and I would have much rather have had that than the mandate in '10.
I'd second this and why I agree with Colorado Dems on this.