Billionaire Donald Trump, a Republican, announced his bid for the presidency with Neil Young’s “Rockin’ in the Free World” blasting in the background, and once again a political candidate has associated himself with a rock star without the endorsement of said star. “Donald Trump was not authorized to use ‘Rockin' in the Free World’ in his presidential candidacy announcement,” Young, 69, told the Los Angeles Times on Tuesday through his longtime manager, Elliot Roberts. “Neil Young, a Canadian citizen, is a supporter of Bernie Sanders for president of the United States of America,” referring to the U.S. senator from Vermont...