David Cameron then did his best to make the Ukip MP's question about the NHS appear facile.
Deputy Prime Minister says Ukip represent 'politics of blame' and he criticises Emily Thornberry over tweet.
Voting for Nigel Farage's party can lose you friends.
Prime Minister on the war path after defeat for Conservatvies in Kent
Farage sticks the boot in to Labour after Rochester and Strood nightmare by Miliband.
YouGov analyst Anthony Wells explains what the Rochester by-election result means for UK politics
Farage in confident mood after Rochester and Strood by-election victory
Thornberry stepped down from the shadow cabinet after tweeting a picture which was deemed snobbish and patronising.
Shadow Attorney General stands down over condescending council house tweet.
The polls are closed in Rochester and Strood, now the real drama begins. Follow it with IBT.
IBTimes UK will be covering details and reactions from the vote result.
Mark Pritchard tells IBTimes UK that he was snapped with Farage after a book launch.
The Rochester by-election candidate made the comments during a TV hustings debate.
The bookmaker says a client from Coventry put £16,500 on Mark Reckless to win on 20 November.
Tories warn that voting for Ukip will tarnish the reputation of areas and slash home values.
Ladbrokes says Kettering MP Philip Hollobone is favourite to jump ship before Christmas.
EXCLUSIVE: Nigel Farage gives IBTimes UK his views on immigration, the NHS, Rochester and Remembrance Sunday.
In an exclusive interview, IBTimes talks politics and cricket with the controversial Ukip leader over a pint or three.
Ukip leader Nigel Farage speaks women, Rochester and prospective coalition allies in exclusive interview with IBTimes UK.
The Ukip leader says he wants a TV debate with Miliband after 24 November.
Exclusive: Geoff Juby tells IBTimes UK that Clegg's presence would not have "much effect".
The Prime Minister made the call after a poll put Ukip on a 12-point lead over the Conservatives.