Liberal Democrats hope a fierce race in Winchester could cause trouble for conservatives who are trying to cling to this constituency that voted to stay.
Now, some voters are considering tactical voting – voting for a non-favorite candidate to defeat an unwanted candidate.
"Normally, I would decide on policies and here the only viable option is to vote for Lib Dem if you don't want a conservative MP," said Karen Euromews, Winchester voter Karen Williams.
The Liberal Democrats, the Greens and Plaid Cymru formed a remaining electoral pact in an attempt to defeat pro-Brexit candidates.
Winchester is one of those 60 electoral districts in which the parties holding the support withdrew candidates not to split the votes. The Green Party candidate left office.
In the 2016 referendum, people in Winchester voted 59% to stay in the European Union.
Paula Ferguson, the Democratic Liberal candidate in Winchester, said many Labor voters told her they would vote for her.
"I sincerely believe we can win this place because there are so many Labor voters here who are telling me, yes, I'm voting for the Liberal Democrat because I want to get this rotten and conservative government from number 10," said Ferguson.
But some voters say they do not support tactical voting.
"Tactical voting should not happen, it should be on your conscience," said voter Tom Polton, who wants to defeat the Labor Party.
Watch the report in the video player above.