Right now there's so much fear, uncertainty, and doubt flying around that there's actually a 17 point swing between "Obama's plan" and the pollster describing the points which Obama desires in such a plan. Much how there was a whole lot of the "have you read the bill?!?" in the townhall meetings before there was any bill to be voted upon. So you have to be careful in how opinion polls are phrased in order to get accurate results.

When you take the aggregate of the various polls out there, there are correlations between support for Obama in the general election (ie, people who voted Democratic) and poverty levels (separate from those who voted for Obama) with support for a public option. You can see where the numbers fall in the link below. Regardless, a plurality of Americans are in favor of the public option - neither one crosses 50% (as there's a number of undecideds), but more are in favor than opposed when you consider neutral-asked questions instead of loaded ones.

As-is, there's roughly 56 votes for the public option in the Senate right now, just not in the finance committee. The finalized bill between the House and Senate versions will most likely include some form of a public option, probably something close to what was in Schumer's Amendment.