Even in the blush of Saturday’s victory, Reid (D-Nev.) is far from having the votes to move his $848 billion package to final passage. At least four centrists have pledged to oppose it in its current form, largely over the public option. Reid is in a bind. Stay to the left, and moderates vote no. Move a tad to the right, and Reid faces insurrection from the left, as liberals in his own caucus and in the House vow not to compromise any further on their signature issue.

As one of the Senate most liberal members, Bernie Sanders (I-Vt.), told POLITICO’s The Arena: “I have made it clear to the administration and Democratic leadership that my vote for the final bill is by no means guaranteed.”…

Here are the battle lines where President Barack Obama’s vision of reform could falter…