Fiorina won't drop out. :( She is the only one who has a 100% chance of beating Hilary. I think Rubio should drop out. He has no chances beating both Clinton and Sanders. He's a (male) establishment Republican mentored by Jeb. Hilary/Sanders will use those traits against him and he will lose. Imo, the candidates who can beat the potential Democrat nominee are Trump, Rand, Fiorina, and MAYBE Cruz.