I think NM is accurate, but I'd put it on the tossup end of Lean D, particularly if Heather Wilson wins the nomination.
I don't get a sense that there's a lot of passionate support for Heinrich, he's just better than the bridges-too-far served up by the NM GOP (Pearce et al.) A centrist Republican from ABQ is another matter. She's actively courting conservative movers/shakers and facing a weak opponent (Lt. Gov. Sanchez; Gov. Martinez is already distancing herself from him and in a relatively showy way).
Isn't more of Martinez trying to avoid a conflict of interest rather than favoring Wilson over Sanchez?