Advertisement A group of Liberal MPs is giving Victorian Opposition Leader Michael OâBrien until May to improve his partyâs fortunes before facing a potential leadership challenge. A group of Victorian Liberals believe they have the numbers to defeat Opposition Leader Michael OâBrien and have set a timetable for a move against him. The group attempting to topple Mr OâBrien believe most of the 31 Liberal MPs support a leadership change. Three spreadsheets, compiled by supporters and opponents of Mr OâBrien and seen by The Age, show who each Liberal MP would probably s...