Clinton/Heinreich vs Walker/Martinez
Both V.P nominees from New Mexico?
Heinrich would be nice as he is a scientist (mechanical engineer).
My thought was that Walker picks Martinez first (since the opposition party usually does) and then Clinton picks Heinreich. It's pretty logical for both of them. A republican nominee needs to show that they aren't entirely the party of old white men and Hillary needs a younger running mate. Heinreich seems like the most natural choice.
Congressman Ben Ray Lujan is also a wild card possibility, ironically also a New Mexican.