After starting 2015 as the presumptive front-runner with a huge bankroll, Jeb Bush has to be ending the year wondering what went wrong with his presidential campaign, what happened to his Republican Party and where all his money went. Mr. Bush and his super PAC burned through more than half of the $133 million they raised in the first three quarters this year. The return on that investment has been a drop in polls from about 15 percent when he entered the race in June to about 4 percent in recent surveys. "He has not been a great candidate and...