The Justice Secretary Jack Straw, no less, is lobbying against the Prime Minister's criminal-justice plans for detention without charge. When he is not fighting the Justice Secretary, the Schools Secretary Ed Balls is waging a war against the Government's own education reforms to further his own leadership ambitions. Perhaps most damaging of all, more than 70 Labour MPs have come out against the centrepiece of last year's Budget - the 10p tax rise on the incomes of the lowest paid.