Jeb Bush's three delegates at the Republican National Convention cost him and his campaign about $50 million each. Bush, who ended his presidential campaign in February after a poor showing in South Carolina, had only three delegates vote for him at the Republicans' nominating convention Tuesday. His campaign and super PAC spent $46 million for each delegate, according to The Washington Post's Dave Weigel. He was a favorite going into the primary season and had substantial financial backing from his family network, but he was unable to muster the enthusiasm his campaign needed. Donald Trump's attacks on Bush as “low-energy”...