(CNN) - Sen. Mary Landrieu is facing new pressure from liberal groups pushing for a public health insurance option.
A coalition that includes MoveOn.org, Democracy for America and Change Congress released a 60-second television ad Wednesday highlighting contributions from insurance companies and other industry interests to the Louisiana Democrat.
"For me, this issue's personal," says breast cancer survivor Karen Gadbois in the ad, which is slated to run in the Baton Rouge and New Orleans media markets for the next week. "So when I see Mary Landrieu take $1.6 million from health and insurance companies, I have to ask: Whose side are you on?"
The ad flashes the number for Landrieu's Senate office in Washington, urging viewers to tell her to "support the public, not her insurance backers."
The groups did not reveal the size of the buy.
The new spot is the latest element of a weeks-long campaign aimed at Landrieu and other senators who have expressed skepticism about or opposition to a public option as Congress weighs a massive overhaul of the nation's health care system. The effort has already included state-level phone campaigns, Web and radio ads.
Last week, MoveOn announced a similar ad campaign targeting Sen. Kay Hagan, D-North Carolina. The group is already running spots aimed at Sen. Dianne Feinstein, D-California.
Landrieu is also facing pressure from the right. Conservatives for Patients Rights, which opposes President Obama's health care plan, has gone on the airwaves in a dozen states - including Louisiana - that are represented by conservative Democrats or moderate Republicans viewed as possible swing votes. The spots urge viewers to call on their senators to reject any government-run option.