The PM has refused to participate unless the broadcasters' initial plans are changed to include the Green Party.
Mr Miliband told the BBC's Andrew Marr Show that the debates should go ahead "with or without" Mr Cameron, who he claimed was "running scared".
Mr Cameron says the broadcasters' plans are unfair.Common sense decency, or a blatant attempt to scupper debates he's scared of participating in?
I suggest third option: Cameron is playing a very smart game here.
If he insists the greens (on 5%) are included, he knows he won't be excluded when his party's ratings hit the same level.