Pressure from outside interest groups isn't just a liberal phenomenon, of course. The conservative group Americans for Prosperity has begun running ads targeting both conservative and vulnerable Democrats, warning of a government take over of the health care sector. Here's the version running in Montana, aimed at Sen. Max Baucus.
The ad is also running in 11 other states, bringing pressure to bear on Sens. Mark Warner (D-VA), Ben Nelson (D-NE), Evan Bayh (D-IN), Mary Landrieu (D-LA), Tim Johnson (D-SD), Blanche Lincoln (D-AR), Kent Conrad (D-ND), Harry Reid (D-NV), Mark Begich (D-AK), Michael Bennet (D-CO), and Claire McCaskill (D-MO), It will air on both network and cable channels.