The Affordable Care Act’s rocky rollout has put Democrats and the White House back on defense — allowing Republicans who were deeply divided over, and under fire for, the partial government shutdown to unite and focus on the failures of

Not coincidentally, a handful of Democrats up for re-election next year in swing and red states have broken ranks with the Obama administration.

New Hampshire Sen. Jeanne Shaheen sent a letter to the president demanding an extension of the deadline to sign up, and almost immediately was joined by Sens. Mark Begich of Alaska, Kay Hagan of North Carolina, Mary Landrieu of Louisiana and Mary Pryor of Arkansas.

None of them was willing to delay or even negotiate ObamaCare a few weeks ago, in the heat of the budget impasse.

Pryor is perhaps the most vulnerable Democrat in the country. Conservative super PACs like the Club for Growth are pounding him. One such ad growls: “We know Mark Pryor supports ObamaCare but lately he’s gotten even more extreme.”

Read More: