According to this Washington Post article, the allegedly "tiny" portion of the Administration's health care reform, the public option, has "taken on a life of its own" among the left of the left.
You have lefty vanguards like Howard Dean and the entire Progressive Caucus basically stating that any plan without a public option is not worth enacting. The Progressive Caucus ratcheted the pressure when they sent a letter (PDF) to the Speaker of the House stating that they could not vote for a bill that did not have a public option. That represents 57 potential "no" votes from the representatives of the Administration's base. That would be a killer PR disaster.
One of the more interesting aspects is how the Tea-Party activists and down-and-out minority party somehow managed to put a popular President, whose party owns the Congress, on the ropes.
One can only hope that America continues to be opposed to the public "option", which, to anyone paying attention, is a stalking/Trojan horse for single-payer health care. Anyone who claims that it is all about "competition" is lying to you.