Jim McMahon held the seat for Labour with a winning 62% of the vote, an increase of 7.3 percentage points. There was a 40.3% turnout.
Candidates
Six candidates contested the election; the statement of persons nominated was released by Oldham Council on 9 November 2015.[4]
The Labour Party, which last held the seat, selected its candidate on 5 November 2015[5] from a shortlist of four: Mohammed Azam, National Executive Committee member and former local councillor; Jane East, who contested the seat of Colne Valley unsuccessfully at the 2015 general election; Failsworth East councillor Jim McMahon, leader of Oldham Council; and Chris Williamson, former MP for Derby North.[6][7][3] McMahon won the selection, reportedly with 232 votes against 141 for Azam in the final round, after the elimination of East and Williamson.[8][9]
The result was considered by commentators as surprisingly good for Labour, who had been expected to be more closely challenged by UKIP.[19] It was also reported as a boost for Jeremy Corbyn's leadership of the party.[20][21]
On the morning after the by-election, UKIP leader Nigel Farage and some other party sources claimed that there had been voting fraud particularly around ethnic minority voters and around postal votes,[22][23][24] with Farage claiming the vote was "bent" and that in constituencies with large numbers of ethnic minority voters who do not speak English, "effectively the electoral process is now dead".[24][25]Paul Nuttall, UKIP's deputy leader, said to journalists: "You've got to ask yourself, is this Britain or is this Harare?"[26] However, others in UKIP downplayed the allegations,[27] with deputy chairman Suzanne Evans saying the party risks sounding like "bad losers".[26]Tom Watson, Labour's deputy leader, dismissed the complaints as "sour grapes".[25]
Farage stated that he was planning to make a formal complaint about the allegations.[24][20] Nuttall wrote an open letter to Greg Clark, the Secretary of State for the Department for Communities and Local Government, raising concerns about postal voting processes.[28]