Unlike David Cameron's remarks - which focused on the political weaknesses of David Davis and Ken Clarke, Mr Bercow has chosen a deeply personal form of attack. "Eton, hunting, shooting and lunch at Whites" made David Cameron the wrong man for the job, Mr Bercow said.
Mr Bercow's implied attack on Mr Davis was more political. Mouthing the same old mantras on Europe, immigration and tax cuts would cause the Tory Party to "sleepwalk" to another election defeat, he said.
Although Liam Fox had made attacks on Ken Clarke's Iraq policy earlier this month, his campaign is now trying to rise above the fray. "We're not going to get sucked into this," a spokesman said, "We're concentrating on the issues. This morning we highlighted the need for lower taxes and English votes on English laws. This afternoon we're talking about the "Broken Society" and need to help Britain's mentally ill. Anything else, frankly is irrelevant."