Prostitution. Bribery. Blackmail. Thuggery. Hypocrisy. Those were just some of the incendiary words thrown around the U.S. Senate last week, and that doesn’t count what people said in private. The Senate may still have a reputation as a genteel club, but lawmakers seemed to abandon rules of decorum completely last week in arguments about whether Congress should be treated like the rest of the country when it comes to Obamacare. Senator David Vitter, a Louisiana Republican, has demanded a floor vote on his bill to end an exemption that members of Congress and their staffs are slated to get that...