Republican politicians today have a choice: either change your base by educating and leading G.O.P. voters back to the center-right from the far right, or start a new party that is more inclusive, focused on smaller but smarter government and market-based, fact-based solutions to our biggest problems.

But if Republicans continue to be led around by, and live in fear of, a base that denies global warming after Hurricane Sandy and refuses to ban assault weapons after Sandy Hook — a base that would rather see every American’s taxes rise rather than increase taxes on millionaires — the party has no future. It can’t win with a base that is at war with math, physics, human biology, economics and common-sense gun laws all at the same time.

Do you know how troubled this party is? Two weeks ago, the former G.O.P. Senate majority leader Bob Dole, a great American, went to the Senate floor in his wheelchair to show his support for Senate ratification of the U.N. Convention on the Rights of People With Disabilities. Nevertheless, the bill failed to win the two-thirds needed for ratification, because only eight Republicans dared to join Democrats in support of the treaty, which was negotiated and signed by George W. Bush!