Paul Kenny is attracting support from beyond traditional Labour supporters as a result of his strong local record, according to party members.
Mr Kenny, a Boston borough councillor, finished second to Mark Simmonds for Labour in each of the past two elections. Labour campaigner Paul Gleeson said: “We have had people who are indicating that they are happy to support him for this election.
“Also there’s a feeling at the moment that one could argue that we have the only truly local candidate.
“Whilst the Tory candidate has a local connection Paul has been an active politician in this area for nearly 20 years and that has gained him some support locally.
“People did also appreciate his mayoralty - there’s an element of that.”
The party is arranging monthly meetings for anyone who wishes to support Mr Kenny’s election bid, regardless of their political persuasion.
Mr Kenny has lived in the borough of Boston since 1991.
Mr Gleeson said the party is largely focussed on running an ‘online campaign’ until Christmas, before it starts canvassing, issuing leaflets and holding stalls. He said he thought UKIP is having difficulty in selecting its candidate due to being a ‘disparate’ group without a tradition of working together and bound solely by a stance on the EU - and pointed to splits since the 2013 county council elections as evidence.