That would be interesting. Considering Chavez is impulsive and not much of a stragigist, He'd prolly get his butt kicked by Mexico. They are after all, experts at infiltrating a country.
Once upon a time, I believe Mexico used to have a pretty good military. I think it's declined in recent years, but it seems as if their new president is very much interested in building it up again and improving its quality (personnel as well as equipment). But I wouldn't put it beyond Chavez, who is widely thought to have been involved in the strange affair of the leftist party that refused to concede the presidential election that they lost, to try an attack if he thought we were busy.