Sen. Bernie Sanders will back Hillary Clinton in exchange for speaking opportunities at fall campaign rallies, a fully-funded campaign aircraft and a share of the credit for her hoped-for election, according to a negotiating memo obtained by BuzzFeed News and dated two days before the June 7 California primary. “Request a plane and staff for a series of fall rallies in battleground states … plane would be paid for by the DNC,” according the the Sanders memo, titled “End Game 2016” and addressed to “Bernie 2016.” The memo’s authenticity has not been confirmed by Breitbart News, but it has not...