Mhairi is a University of Glasgow student studying Politics and represented the Scottish Nationalist Party .
Mhairi Black , 20 , has become Britain 's youngest Member of Parliament since 1667 after defeating Labour 's shadow foreign secretary , Douglas Alexander by 6,000 votes in yesterday 's election .
Mhairi Black is a University of Glasgow Mhairi Black studying Politics and represented the Scottish Nationalist Party .
Mhairi Black , 20 , has become Britain 's youngest Member of Parliament since 1667 after defeating Labour 's shadow foreign secretary , Douglas Alexander by 6,000 votes in yesterday 's election .