A new $1.3 million ad campaign will target 17 House Democrats this week urging them to support President Barack Obama's health care plan.
The ads are funded by labor unions and other groups backing health care reform.
At least seven of the lawmakers -- including Rep. Brad Ellsworth of Indiana -- voted in favor of the legislation last year.
Other targets of the ads voted against the measure, but face intense pressure to switch their vote. Those include John Boccieri of Ohio, Jason Altmire of Pennsylvania, Suzanne Kosmas of Florida and Scott Murphy of New York.
Obama and congressional Democratic leaders are trying to garner the support for his top domestic initiative, with votes possible later this week.