Nevada has had a Republican governor since 1999. Sandoval, the current governor, is in his second term, was reelected about year ago with 90% of the vote in the Republican primary and 70% of the vote in the general election, and currently has something like a 2/3 approval rating in state polls.
His Wikipedia page currently has one section which is a long hit piece written by pro-solar flacks, but that seems likely to be cleaned up as soon as other Wikipedia editors take notice. Other than that, I don’t see much evidence that he’s in any particular trouble.
“Political suicide” seems like a fairly dramatic exaggeration, unless you’re sitting on some information the rest of us don’t know about.
(Note: I think the Nevada Republican party is crazy, and am strongly pro-solar myself... but let’s not kid ourselves here.)
Edit: Sandoval’s statement about the SolarCity announcement, http://www.news3lv.com/media/lib/166/0/e/8/0e8f2127-0e76-464...