@engineer,
This might be far-fetched, but sometimes I wonder if Jeb is staying in and hopes that as time goes on the others will run out of money or get discouraged and drop out. I don't have a clue if the Bush family and friends have enough money to maintain him. I suspect he's hoping that by the time its down to the front runner he will be the only other candidate and is expecting to be more palatable than say Carson, Cruz or Rubio. I don't think Carly will stay in much longer, but the extremely far out long shot is Rand Paul. He's making the rounds of the late night shows and has been much more likable when he's not pandering to the far right. That's jut me spitballing, but I do hope the republicans run a candidate that doesn't send me into a panic. If the Republicans gain the White House I want to be able to feel happy that the winner is not another rash thug like Bush 43.