KUALA LUMPUR, Aug 1 — Gerakan threw its support behind political foe Tan Sri Khalid Ibrahim to remain Selangor mentri besar today, even as the Pakatan Rakyat (PR) pact that rules the state is in tumult over the PKR man’s leadership. “Khalid is a prudent man and better than other alternatives for the top state post,” Gerakan president Datuk Mah Siew Keong was quoted saying in Alor Setar…