BOISE, Idaho. - The mayor of an eastern Idaho town where second- and third-grade students chanted "Assassinate Obama" after Barack Obama's Nov. 4 election victory has publicly apologized, saying there's no excuse for such comments. Rexburg Mayor Shawn Larsen wrote to local newspapers he was saddened by the notoriety his community had received over the incident. He received e-mails from as far away as Canada. Larsen told The Associated Press, "When people don't stand up and say, 'That's not appropriate, that's wrong, and those are hateful remarks,' it's almost like they are saying that it's an OK thing to do....