They think he wasted money on everything from an iPad-sized video mailer to direct mail for donors in states that don’t yet matter. They think his attacks on Marco Rubio are doing more harm than good. And they worry that, at the end, all he will have accomplished is the destruction of the Bush family brand.The big-money supporters fueling Jeb Bush's super PAC have found their boogey man: Mike Murphy, a sharp-witted, Twitter-obsessed veteran GOP ad man who runs Right to Rise.If Bush's campaign ends with anything other than the GOP nomination, blame is certain to be widespread.