Media commentators have been calling Mitt Romney the GOP presidential frontrunner and general consensus has him as the unofficial party nominee for president. So excited speculation is shifting to who will be the vice president.

So far, the popular choices, all of whom already serve in public office — and who the majority (with the exception of a couple) have vowed to fulfill their unfinished terms — have deflected suggestions that they will be Romney’s running mate.

One of those under speculation is New Mexico Gov. Susana Martinez. As CNN’s Candy Crowley said, Martinez has “a trifecta of political assets: female, Hispanic and a swing state governor.”

Martinez issued the usual thanks, but no thanks — citing the customary “commitment to serving a full term as New Mexico’s chief executive and reaching her goals for the state before “jumping ship” — but with a twist:

Martinez told the Journal recently that her responsibility as guardian of her developmentally disabled sister, Lettie, in Las Cruces is one that she can’t take to Washington, D.C., regardless of who calls.

“The family has to be a consideration, and for me to take (my sister) to Washington would be to separate her from … the family that’s down there, and that would be devastating,” Martinez said. “I just couldn’t do it.”

…Staying in Las Cruces allows Martinez’s 54-year-old sister to remain near their father, Jake, who suffers from Alzheimer’s disease and lives nearby in El Paso, Martinez said. Despite the Alzheimer’s, Martinez has said, her father has continued to recognize her sister.

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