Former Republican presidential candidate Mike Huckabee is set to participate in a rally in Omaha, Neb., Sunday afternoon to try to persuade Sen. Ben Nelson (D-Neb.) to reverse his position on the Democratic health care bill, the Omaha World-Herald is reporting.

Nelson had vowed to filibuster the bill if it did not explicitly prohibit the bill from using federal funds to cover abortions. But the moderate Nebraska Democrat on Saturday announced he had accepted compromise language on the issue. Republicans and anti-abortion-rights groups have excoriated Nelson over his position.

Rep. Lee Terry (R-Neb.) and other elected officials are scheduled to attend the rally. Huckabee, a former Arkansas governor, ran as an ardent conservative in 2008 and is staunchly opposed to abortion.