Ramesh Ponnuru of National Review contends in his latest column that those looking for the source of Republicans’ presidential election loss need to cast their glances beyond Mitt Romney.

None of them makes the mistake of assuming that this election should have been easy to win given the weak economy, the public’s dissatisfaction with the status quo, and the unpopularity of Obamacare. They know that the economy has been improving, that the Democratic base in presidential races has been expanding for decades, and that the public still blames George W. Bush and his party for an economic crisis that began during his second term. Nor are they entirely wrong in their diagnoses of Romney’s distinctive weaknesses and errors. They err mainly in attributing too much importance to them.

Romney was not a drag on the Republican party. The Republican party was a drag on him. Aaron Blake pointed out in the Washington Post that Romney ran ahead of most of the Republican Senate candidates: He did better than Connie Mack in Florida, George Allen in Virginia, Tommy Thompson in Wisconsin, Denny Rehberg in Montana, Jeff Flake in Arizona, Pete Hoekstra in Michigan, Deb Fischer in Nebraska, Rick Berg in North Dakota, Josh Mandel in Ohio, and of course Todd Akin in Missouri and Richard Mourdock in Indiana. In some cases Romney did a lot better. (He also did slightly better than Ted Cruz in Texas, a race Blake for some reason ignored.)

None of those candidates were as rich as Romney, and almost all of them had more consistently conservative records than he did. It didn’t help them win more votes. The only Republican Senate candidates who ran significantly ahead of Romney were people running well to his left in blue states, and they lost too.