reporter: one of these candidates may be brexit opponent kelly-marie blundell. she believes a second referendum could be an option. kelly-marie: hi, good morning. i'm kelly-marie blundell, i'm taking over from norman baker. so i'm your candidate in the general election. reporter: blundell is going from house-to-house. she's the liberal democrat candidate for lewes. to get a seat in parliament, she needs to get the most votes in the constituency. kelly-marie: it's very, very narrow. it's 1000 votes between us and the current mp. and there's every opportunity to take this seat back, which is what we're aiming for, ultimately. and lewes voted remain in the referendum as a majority. reporter: many in lewes want to vote strategically. for example, ian harrison voted for labour in 2015, though they had no hope of winning. to avoid a hard brexit, this time he's going to vote for the liberal democrat, blundell. ian: i think my politics are center-left, and i choose the candidate i think has the most chance of representing my beliefs in parliament. reporter: 16,000 people