I've been following O'Rourke on Facebook for the past couple of months. Maybe that means I've drunk the Kool-Aid, but I really think he has a serious shot. He's naturally very charismatic and likable, he's got the same kind of oratorical flourish that Barack Obama has, and his fundraising totals are impressive, especially considering that he's using the Bernie Sanders model. I think this is going to be THE upset 2018. And from there, he's going to inevitably become name dropped as a presidential contender, especially since he fits thematically with the re-emergence of the Democratic party as an electoral force in the Southwest.
Going full on hack and picking "Lean D".