Voters go to the polls in Rochdale, near Manchester, on Thursday in yet another Westminster byelection – the third this month – after a chaotic campaign that played out against a febrile national political backdrop fuelled by accusations traded between the parties of religious and ethnic bigotry. Veteran left-winger George Galloway is the bookies’ favourite to win the byelection, which became necessary following the death in January of the sitting Labour MP for Rochdale, Tony Lloyd. Labour’s bid to record a hat-trick of February byelection victories was thrown into chaos earlier this month when its candidate in Rochdale, Azhar Ali,...