ROCHESTER, ENGLAND - OCTOBER 16:  Prime Minister David Cameron takes questions from the audience after introducing the Conservative Party's two applicants councillors Anna Firth (not seen) and Kelly Tolhurst (not seen) for their nomination in the upcoming Rochester and Strood by-election forced by the defection of Mark Reckless to UKIP last month at Wainscott Memorial Hall on October 16, 2014 in Rochester, England. (Photo by Ben Gurr - WPA Pool/Getty Images)