The government will granted a half-day debate to the DUP just a week before the elections to Stormont.
Shadow chancellor says Leader of the House would "talk to all parties" but rejects negotiations on the Budget and defence.
The PM suggested that a Labour government reliant on nationalist support would be forced to cancel infrastructure projects outside of Scotland.
After the nationalists' pledge to oppose the Tories, Miliband could simply invite them to support a left-wing Queen's Speech.
The election debate is being defined by the claim and counter-claim of two nationalisms – one Scottish and out, and one British and in denial.
The swing in Labour’s heartlands is even greater than the swing implied by national polls.
Last night’s debate made for good television but told us little we didn’t know and changed nothing. And so the jamboree goes on.
Miliband again impressed - but the limits of the format left him unable to land the knock-out blow against the PM he craved.
Labour's best hope of turning the SNP tide is to focus on the Conservatives.
The SNP's stance and the Tories' missteps mean Miliband is in the strongest position to become prime minister.
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