Rep. Stephanie Herseth Sandlin's (D-S.D.) office says she will vote 'no' on the health care bill, even as former top Obama aide Steve Hildebrand threatens her with a primary challenge.

Her office office said she will not bow to pressure.

"There's been pretty constant and strong pressure here for a while. We feel it every day," deputy chief of staff Russ Levsen told the Rapid City Journal. "That's part of being in the majority and being one of 39 House Democrats to vote against the health care bill last November."

Hildebrand has threatened to primary Herseth Sandlin if her vote sinks the bill or comes close to it. It looks like the vote will be close either way, so the ball's in his court now.

Hildebrand did not immediately respond to a request for comment.