Zeferino Torreblanca Galindo was a professional politician for the PRD from 1992 until 2010, despite never bothering to become a member of the party. When he failed to have his chosen successor imposed as the PRD candidate in 2010, he very publicly broke with the party, which he referred to as "bandits, mercenaries, poisoners."
His abysmal administration is currently being audited.
Yet Torreblanca - to recall, a former governor - is hardly done with politics, and now aims for the mayorship of Acapulco - for the PAN.
PAN is almost non-existent in Guerrero, and apparently they see in Torreblanca the possibility to make inroads in the state, yet given his unpopularity I doubt he'll stand a chance - and only serve to label the Guerrero PAN as highly opportunistic.