Tories on gay marriage: Peter Bone and Tim Montgomerie
10 December 2012 Last updated at 13:48 GMT
There is "no mandate in any political party, not in any manifesto" for gay marriage said Tory MP Peter Bone, who said marriage should be between a man and a woman.
ConservativeHome editor Tim Montgomerie said the Freedom to Marry campaign group spoke for "mutual tolerance and support for equal rights".
The pair debated a Daily Telegraph letter from leading Conservatives - including David Cameron, John Major, Michael Gove, and Boris Johnson - backing gay marriage.