Mostly just democrats with vote for sale. Remember how they stopped ACA, until their price was met.
Yeah, Mary Landrieu with her Lousiana purchase, Ben Nelson with his Cornhusker deal and Bart Stupak. These were supposed to be pro-life Democrats who were taking money from the Pro-Life organizations while making deals with the Dems. Remember the elaborate deal they made? It was the exact same devious tactic that they used in the amnesty for illegal aliens. First the Dems tried to make a deal with John McCain and his usual band of collaborators, then when this didn’t work, they realized they didn’t have enough Dems in the liberal areas of the country so they had to go to the more ‘conservative’ Democrats like Landrieu, Nelson and STupak. They didn’t have the cover of the McCain faction of the Republicans so they couldn’t use the old canard about it being a ‘bipartisan’ deal. They were flushed out and shown for what they were.