No.http://www.theguardian.com/uk-news/2014/aug/11/labour-soar-past-tories-seven-point-lead-icm-poll?CMP=twt_fd
"The poll, carried out between Friday and Sunday, followed a difficult week for the prime minister after Warsi resigned from the government after criticising the prime minister for his "morally indefensible" decision not to criticise Israel for disproportionate action in Gaza. On Wednesday Boris Johnson signalled his intention to return to parliament at next year's general election, placing him in a strong position to replace the prime minister.
The London mayor is the dominant figure in the race to succeed Cameron, according to the poll which shows nearly a third of voters (29%) believe he should be the next Tory leader."
Maybe perception over divisions on the Tory leadership. Also there is a significant Muslim vote and it can't be particularly enamoured by Cameron at this time.