HANOVER, N.H. (AP) — Republican presidential primary candidate Mitt Romney says repealing Democrats' national health care plan is not enough. The former Massachusetts governor says Republicans have to be ready to replace it with something.Romney said Tuesday he wants to do away with President Barack Obama's health care overhaul. He says that can't be the end of it, though.Romney and Texas Gov. Rick Perry are debating how to best do away with the law. Romney says all of his rivals owe it to voters to put forward a plan to help more Americans get health care, but one based on free markets.The comments were made during the Bloomberg-Washington Post presidential primary debate held at Dartmouth College.