This time it’s Louisiana’s Mary Landrieu:

U.S. Sen. Mary Landrieu told a relatively friendly overflow Monroe Chamber of Commerce crowd that she would likely oppose any government insurance option in health care reform and lobby against a proposed energy tax known as Cap and Trade.

Landrieu, D-La., who spoke during a chamber luncheon today, also met with local doctors earlier and briefly addressed about 15 demonstrators opposing a public insurance option and Cap and Trade.

When asked after her speech if the senator would support a public option under any circumstances, she said, “Very few, if any. I’d prefer a private market-based approach to any health care reform that would extend coverage.”

“I’d like to cover everyone — that would be the moral thing to do — but it would be immoral to bankrupt the country while doing so,” Landrieu said.

Okay, so it’s not an absolute no… she probably doesn’t wanna break with the party platform quite that blatantly. But clearly, she’s not gonna be a rubber-stamp for single-payer either.

If single-payer keeps losing support among Democratic Senators, it really won’t matter what Speaker Pelosi does over in the other chamber, it’ll die in the Senate.

As for the sometimes-mentioned “reconciliation” maneuver to pass it… I admit that His Obamaness and the Obamacrats has been really politically tone-deaf from time to time (calling town-hall participants “un-American,” for example), I think it’s likely that they realize that if they push the bill through using a back-door trick like that will really cause a political firestorm (note, I said a political, not a literal, firestorm–so misconstrue it at your own peril) that could permanently damage the “Democrat brand.” And I doubt they’d want to do that.