He did say he wasn’t going to run and did finish the last legislative session/special session before deciding.
His Wife is actually the one who convinced him to run saying, “it’s time to get out of your comfort zone”
http://news.yahoo.com/blogs/ticket/rick-perry-says-wife-wants-him-run-president-200449985.html
This was in answer to a question at a Republican debate during the election:
"What that means is that I've got a lot of faith in the Lord," Perry said. "I hope he's going to let me live for four years, and if he does, I will serve out my governorship."
Cindie