How many candidates for Congress—Democratic and Republican—have you heard loudly insist that they don’t believe in party labels, just in doing the right thing? And how many of them, once elected, end up voting with their party pretty much all the time? It’s an absurd dance. Voters like hearing about “independence” and “bipartisanship,” so candidates indulge them, only to take office and immediately morph into the party-line loyalists they just spent a year swearing that they weren’t. There are some exceptions to this rule (Arlen Specter comes to mind), but by and large, you can predict how more than 90 percent of senators and House members will vote on anything just by their party label.