Why Lib Dems are anything but a 'dead parrot' as by-election looms

Referring to their bird logo, Margaret Thatcher once described the Lib Dems as "a dead parrot"- referencing the famous Monty Python sketch (she herself had never seen it, thinking Monty Python was a person).After the 23 June both Theresa May and Jeremy Corbyn embraced leaving the EU pretty much wholesale lest UKIP continue to bite at the main parties' heels, taking votes from leave voters.