Politics: With the Massachusetts Senate race in a dead heat, the Service Employees International Union makes a massive ad buy for a Democrat raising money from lobbyists. Sorry, Sen. Kerry, but the tea party's coming. Having received a tsunami warning, the purple shirts of the SEIU have sprung into action with a major ad buy trying to pull the Senate candidacy of Massachusetts Attorney General Martha Coakley from the jaws of defeat. The buy size of $685,000, extracted from the union dues of not-always-willing workers, is one of the biggest of the election. The ads note that Republican Scott Brown...