A former Republican senator is endorsing Hillary Clinton for president after the mass shooting in Orlando, Fla., citing her support for gun control. Former Sen. Larry Pressler (R-S.D.) called for universal background checks on all gun sales and an assault weapons ban Monday in the wake of the deadliest mass shooting in U.S. history. “I can’t believe I’m endorsing Hillary Clinton for president, but I am,” said Pressler, who spoke with The Hill on Monday after endorsing Clinton in a statement issued over the weekend. “This morning, I woke up and told my wife, ‘Did I really do that?’” he...