As the debate over health care continued on Capitol Hill, Wednesday, hundreds of abortion supporters delivered a specific message to Congress-- "Stop Stupak."

The Stupak amendment-- named after pro-life congressman Bart Stupak, was approved by the House to keeps tax dollars from being used to pay for abortions.

Opponents of the amendment call it the most significant roll-back of women's rights since abortion became legal.

"I am here to tell you in no uncertain terms that we will pass a health reform bill and it will not have the Stupak amendment in it," congresswoman Jan Schakowsky said.

The abortion rally comes as Sen. Ben Nelson, a conservative Democrat from Nebraska prepares to introduce a similar amendment in the Senate.