Top GOP donor Barry Wynn has confirmed to ABC News that he will leave Rick Perry to endorse Mitt Romney.

Wynn said he could no longer support Perry in the wake of his recent criticism of Romney's work at Bain Capital.

"I really am not comfortable with the Bain attacks and I am pleased that Governor Perry has moved on from the subject. However, I am now supporting Romney," Wynn said.

Rick Perry is depending on a strong finish in South Carolina to stay in the presidential race.