Poll warningpublished at 14:10 Greenwich Mean Time 20 February 2015
A word of caution from Anthony Wells at the UK Polling Report, external blog. He's wary about the Lib Dem polling, external the party has been briefing about which we mentioned earlier (see 10:00 entry below). Mr Wells suggests there's a strong "publication bias" which might make Nick Clegg's party look better than it is. "The articles claim that the Lib Dems have done about 100 constituency polls, while it seems journalists were shown results from about a dozen or so, so it is impossible to know how representative this group were, or whether they were cherry-picked to create a good impression of the Lib Dem performance," he says. Reports on the polling have suggested the party is performing especially strongly among women and young voters.