I see left-libertarian Labour MP Bob Marshall Andrews is backing Davis. And so is Nigel Kennedy the violin player - Guardian today:

"David Davis is gathering a head of steam for his re-election to his former seat of Haltemprice and Howden, including a promise from violinist Nigel Kennedy, to busk for him. Kennedy's declaration - "'cos music can bring people together a little bit on this issue" - could scarcely have been more public, coming on the BBC, although it has been pointed out that Kennedy's own civil liberties could be curtailed if he does not take out a busking licence first. Also in the Davis entourage is Labour MP Bob Marshall-Andrews."