Labour last night selected moderate candidate Jim McMahon to fight the Oldham by-election, in a move described by jubilant centrist MPs as a “bloody nose” to Corbyn. Guido is more amused by the performance of the Momentum-backed Corbynista candidate, Venezuela-loving crackpot and failed ex-Derby MP Chris Williamson. Despite having the might of Jon Lansman’s ‘mass grassroots movement’ behind him, according to HuffPo he got grand total of 17 votes. If Corbynmania is “sweeping the nation”, it hasn’t reached Oldham…