"We applaud those candidates who did sign the pledge for vowing to support and advance the protection of life at all stages if elected to the White House," she said. "Their signatures demonstrate that mere lip-service to protecting women and the unborn is not enough — it must be backed up by concrete action."
In addition to the taxpayer funding language, the pledge states that if elected, the candidate would support only Supreme Court nominees who are committed to "applying the original meaning of the Constitution" and "would select pro-life appointees for relevant cabinet and executive branch positions."
Romney's decision would seem to play better with general election voters. But among the more socially-conservative Republicans who vote in primaries, his abortion position could be a problem.
"I know the economy is the top issue, but the life issue can make the race," Musgrave said. "It's the pro-life people who show up."
Romney, meanwhile, hopes to patch things up with the SBA List, despite his refusal to sign.
"Governor Romney has been a strong supporter of the SBA List in the past and he looks forward to continue working with them to promote a culture of life," Saul said.
Former Sen. Scott Brown, R-Mass., candidate for U.S. Senate in New Hampshire, holds his hand over his heart during the singing of the national anthem as he waits to take the stage for his town hall campaign rally with Sen. John McCain at the Pinkerton Academy in Derry, N.H., on Monday, Aug. 18, 2014.