A new TV ad that begins airing in Iowa and New Hampshire this weekend showcases Mitt Romneys’ past pro-choice views, further complicated his attempts to shore up conservative Christian support. Republican rivals Fred Thompson and Mike Huckabee have also stepped up their attempts to raise doubts about Romney’s commitment to the pro-life cause. The new ad comes courtesy of the group Republican Majority for ChoiceGod-o-Meter is curious to see how this new round of attacks on Romney affect his poll numbers in early primary and caucus states. One of the biggest questions on GOM’s mind these days centers on how firm Romney’s support is among the decent-sized chunk of Christian conservatives he’s managed to win over thus far.5