Over at PoliticalBetting, Chilon suggests that Johnson may follow Estelle Morris and admit that he is "not up to the job".
Liberal Conspiracy's Sunny Hundal posts footage from 2009 of Cameron defending the Education Maintenance Allowance.
Support for the Liberal Democrats has plunged by more than half since the 2007 elections, reports Left Foot Forward's Ed Jacobs.
Paul Waugh says Cameron's description of the NHS as "second rate" will allow Labour to hammer him.
Finally, at Stumbling and Mumbling, Chris Dillow reviews a new paper looking at the impact the death of a parent has on future earnings.