(CNN) - Another political organization is readying to flood the television airwaves this week as House members get set to take a final vote on the health care reform bill.
Citizens United, the conservative political advocacy group that recently won a landmark Supreme Court ruling rolling back campaign finance regulation, announced Tuesday it is planning a $600,000 media campaign targeting vulnerable Democratic members of Congress who initially voted for the health care bill in 2009.
In targeted television commercials and a planned 1.3 million phone-call drive, the group aims to encourage constituents in the selected districts to flood their representatives' offices with expressions of opposition to the measure.
"These Representatives voted yes on ObamaCare last year," said David Bossie, president of Citizens United. "Before they cast their vote this week, they should take care to listen to what their constituents have to say."
The targeted Democrats include Reps. Mark Schauer of Michigan, Mike Arcuri of New York, Gabrielle Giffords of Arizona, Steve Kagen of Wisconsin, Baron Hill of Indiana, Chris Carney of Pennsylvania, John Salazar and Colorado.
The announcement of the ad campaign comes the same day a conglomerate of health care proponents unveiled a $1.4 ad buy targeting 17 Democrats who have not publicly announced how they will vote for the measure.