Of course this is fraught with consequences. The maneuver can be used against the Dems if they are in the minority. But there is a belief on the far left that healthcare will solidify Dem support among more than enough of the voting public so as to never be in the minority again. It's been a truism of the left Dems since Harry Hopkins and the New Deal chortled, "Tax tax tax. Spend spend spend. Elect elect elect." A party with that thought process may not be in fear of the consequences you cite.
They're betting the farm.....
.....We all lose if they win.
Even they will lose, but they are too dim to see it yet.