Isn't more of Martinez trying to avoid a conflict of interest rather than favoring Wilson over Sanchez?
What conflict of interest?
FYI, shortly after Sanchez announced, Martinez reduced Sanchez's Lt. Gov. duties to only those duties mandated by the State Constitution. On conservative radio here, it's being seen as a foregone conclusion that Martinez will, at some point, endorse Wilson, and certainly will not endorse Sanchez.
The knock on Heather is that she is seen as a RINO and has some connections to Bush-era profligacy -- an endorsement from Martinez likely makes a lot of that concern go away (except in the blood red hinterlands).