A Conservative candidate could compete for Nick Clegg’s parliamentary seat if the swing at the Copeland by-election were to be replicated in Sheffield.
Under changes proposed by the Boundary Commission, the seat would expand into a new Sheffield Hallam and Stocksbridge constituency.
A second phase of consultation on the proposals begins tomorrow, when responses to the first phase are published.
Anthony Wells, a polling expert, calculated that Labour would have won the new seat in 2015, with 35% of the vote compared to 28% for the Liberal Democrats and 21% for the Tories.
The Conservatives won Copeland on Thursday, on a 6.7% swing from Labour.
A two-party swing of 6.7% in Sheffield Hallam and Stocksbridge would put the Conservatives on 27%, just behind Labour and the Lib Dems on 28%.
Mr Clegg held the seat in 2015 on the old boundaries, with 40% of the vote.
Top image by secretlondon123 (Flickr: polling station) [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons