Bernie Sanders says he’ll support Hillary Clinton if she makes his agenda her agenda. It brings to mind a line from “The Boxer”: “I have squandered my resistance for a pocketful of mumbles.” If I thought it mattered I’d be offended, but we’re talking about a few lines in the platform, a document that exists in part to throw sops to losing candidates. (“Such are promises.”) All this is beside the point. Congress is broken. Until Congress is fixed, there is little a president can do except nibble around the edges of problems with executive orders. Just ask President Obama.