Somehow, I doubt that when the names on your ballot are Jeb Bush and Barack Obama, you’ll leave the line blank.
The argument that Jeb Bush isn’t electable is a good one. The argument that Jeb Bush is unacceptable AS President is absurd.
We could do a LOT worse than Jeb Bush. We could do a lot better, but I’d take Jeb Bush in an instant if it meant no Romney.
Trust me, I would have no problem leaving the line blank if these were my only choices.