Breitbart News published at least 30 stories in the past week about Donald Trump's theory that Sen. Ted Cruz is ineligible to run for president because he's not a natural born citizen, moving into birther territory despite a previous categorical statement from a lead editor that Breitbart is "not a birther site." "I think pretty categorically, I think I can talk for our editorial team and I can certainly talk for Andrew [Breitbart]," Breitbart editor-at-large Ben Shapiro said in 2013, responding to criticism over the site's coverage of President Barack Obama's birth certificate. "We're not a birther site." A spokesman...