Compromised with who? The insurance industry? Or do you just mean the compromised their integrity? That much seems obvious.
Why don't you just answer for me?
Ok.. I can only guess - but here's what I think happened. Most of them did really want single payer, or at least a public option. I mean, they're Democrats - they gotta love government running things. But they either weren't confident the public would be behind them, or were too afraid to spurn their corporate benefactors.
I think that they intend to screw things up so badly that Single Payer will eventually look good in comparison.