Republicans were united in opposition to Obama, but it’s much tougher to stay united on offense. There are a lot of working-class Republicans, for example, who don’t believe the government has any business messing around with their Social Security and Medicare. So Paul Ryan’s budget is a tough sell, and it’s clearly an area where Democrats may see an opportunity to drive a wedge between the president and congressional leaders. Democrats should look for these kinds of vulnerabilities. They should not be deferential at all when it comes to the confirmation process. And they should try to derail a quick repeal of the Affordable Care Act. The idea for Democrats should be to slow things down.