From some pro-Ed Miliband chopper:

Ed’s enemies have no discernible principle, however misguided. They dream only of David: limp, charming US conformist, token foreign secretary, but the rightful heir to the shining void of Blairism. Childish beyond words, their view is supplemented by the trivialist press. Sketchwriters, too idle to stay for any parliamentary business except the leaders’ set piece, expatiate on voice timbre, assurance quotient, facial appearance and high-profile oneupmanship. The government meanwhile is rolling over in contradictions, policy reversals and ‘clarifications’. The opposition won’t need a ‘stronger’ leader to defeat them at the next election. They might try calm or reticence or even unity – or that bit in the Brer Rabbit books about lying low and saying nothing.

I'm pretty sure that at least some of Ed's enemies have a very clear principle for opposing him - the fact that he's shit.