At just 20 years of age, Black challenged Labour candidate Douglas Alexander for the seat in Scotland, which had previously been a secure Labour seat for a number of years. Described as a 'rising star' she was said however, to have 'found herself at the epicentre of the hurricane which seems to have swept through Scotland since the independence referendum last September,'  with recent polls suggesting that Black could be set to overhaul Alexander who held a majority of 16,614 in the 2010 election.
The Guardian noted that Black 'was up against one of the best-known Labour MPs left in Scotland, Douglas Alexander, who was defending a majority of more than 16,000.'  Despite this, Black was able to win the seat in 2015 with 51 per cent of the vote share and a majority of 5,684. 
- Election 2015 BBC, accessed 7 May 2015
- SNP hopeful Mhairi Black: "People want a change." Daily Record, 5 May 2015, accessed 7 May 2015
- Head-butts, Nazis and 'sham' campaigns: The scandals linked to the SNP firebrands who could be MPs The Telegraph, 2 May 2015, accessed 7 May 2015
- Mhairi Black: the 20-year-old who beat a Labour heavyweight The Guardian, 8 May 2015, accessed 8 May 2015
- SNP's Mhairi Black becomes Britain's youngest MP since 1667 after defeating Douglas Alexander The Telegraph, 8 May 2015, accessed 8 May 2015