If this year’s political ads sound like you’ve tapped into Nick at Nite reruns of old campaigns, you’re not imagining it. That’s because there’s little new in politics; it only seems that way sometimes when candidates repackage old ideas. If you’re facing an incumbent, the usual strategy is this: Everything bad that’s happened in the last (two, four, six) years is his or her fault, and everything good is either ignored or someone else’s doing.