Of the 24 signatories to the letter attacking Labour's plan to reintroduce the 50p tax rate, eight have donated to the Conservatives.
The Labour leader had no convincing riposte to Cameron's claim that he was "an arsonist" who "complains that the fire brigade aren't putting the fires out fast enough".
Unemployment fell at its fastest rate since 1997 to 7.1% but average earnings rose by just 0.9% - 1.1% below inflation.
Any communications strategy devised in Downing Street also has to compete with noisy agendas elsewhere in the party.
The "truce" between the two leaders lasted just a week as Cameron declared that Miliband had "all the moral authority of the Reverend Flowers".
To date, the coalition has unforgivably weakened Britain's climate adaptation plans.
Miliband and Clegg are ready to sign up to three debates over three weeks. They say Cameron is running scared.
The Prime Minister's persistent refusal to debate Salmond will become a running sore and an increasingly dominant aspect of the campaign.
The PM's warning that means-testing pensioner benefits would raise only "a very small amount of money" was the most notable moment in a sombre session.
The PM's loose talk on tax has distracted from his popular pledge to maintain the triple lock on the state pension.