Given the choice between Chavez and Petkoff, I'd choose Petkoff. He is the perennial outsider, but as far as I know he is an honest man.
To be a rebel under a dictatorship doesn't make you evil. He has basically opposed Chavez from the beginning, seeing him as a fake and a madman.
A Petkoff is probably the only way back from a Chavez to constitutional government, which is why it isn't going to happen; Chavez controls the computers. I would say that Petkoff is their best chance, however. They will need to first win the election convincingly, and then when Chavez steals it, they will need to march down to the palace and take it. An old rebel like Petkoff will know what to do, I hope.
Bump!