happened: how good subjects were at math stopped predicting how well they did on the test. Now it was ideology that drove the answers. Liberals were extremely good at solving the problem when doing so proved that gun-control legislation reduced crime. But when presented with the version of the problem that suggested gun control had failed, their math skills stopped mattering. They tended to get the problem wrong no matter how good they were at math. Conservatives exhibited the same pattern—just in reverse.