The Glasgow Cathcart by-election to the Scottish Parliament was held on 29 September 2005. It was caused by the resignation from the Scottish Parliament of Mike Watson, who won the seat at both the 1999 and 2003 elections. Maire Whitehead, a previous candidate in Cathcart and a former Primary School Headteacher was chosen by the SNP as their candidate on the same day as Gordon was selected by Labour. She defeated Bill Kidd, twice a candidate elsewhere in Glasgow and the SNP Trade Union Group organiser and Tommy Tonner, a Glasgow-based consultant.