GLASGOW, SCOTLAND - NOVEMBER 10:  A man walks past the local shops in Sighthill, which is part of Glasgow North East constituency November 10, 2009 in Glasgow, Scotland. Candidates are entering their final week of campaigning for the seat made vacant by former Speaker of the House of Commons Michael Martin, who resigned in June due to his role in the MP's expenses row. Getty Images logo Getty Images 3 weeks ago

GLASGOW, SCOTLAND - NOVEMBER 10: A man walks past the local shops in Sighthill, which is part of Glasgow North East constituency November 10, 2009 in Glasgow, Scotland. Candidates are entering their final week of campaigning for the seat made vacant by former Speaker of the House of Commons Michael Martin, who resigned in June due to his role in the MP's expenses row.