I have read several accounts of the removal of Houston from office after Texas voted to secede and join the Confederacy. While he contended his removal was illegal I've never seen anything anywhere that says he was physically dragged out of the capital "clawing and digging." Now him physically resisting, especially since he was a crippled old man, is a significant enough event I would think it would show up somewhere in the official documents I've read.
Houston was a slave holder and a devout believer in states rights but believed no good could come of secession.
From remarks he made on April 1, 1861, two weeks after having been removed from office:
"Let me tell you what is coming. After the sacrifice of countless millions in treasure and hundreds of thousands of lives, you may win independence if God is not against you. But I doubt it. I tell you that while I believe with you in the doctrine of States Rights, the North is determined to preserve this union. They are not firey, impulsive people a you are, for they live in colder climates. But when they begin to move in a given direction, they move with the steady momentum of a mighty avalanche; and what I fear is they will overwhelm the South."