The revolving door at the top of the Australian Labor Party continues to spin, with ex-Foreign (and Prime) Minister, Kevin Rudd, challenging the current Prime Minister, Julia Gillard, for her job on Monday morning. Three things are notable about this challenge: its speed (Rudd formally announced his intention to stand on 24th February and the ballot will be held on the 27th); its ferocity (military metaphors like ‘mutually assured destruction’ scarcely seem overblown); and the fact that Rudd was ousted from the PM job only twenty months ago. Ms Gillard should win convincingly.  Although 58% of Australians think that Rudd would make a better leader, Gillard’s parliamentary colleagues support her by a ratio of two to one.   Mr Rudd’s deep unpopularity amongst …