But what sort of supporters would the SNP be? Not for them the discreet negotiations behind closed doors. There are two reasons why.
First, there is the personality of Alex Salmond, who looks likely to lead a large bloc of SNP MPs. His preference will be to strut and swagger and bully. That is what he does.
But there's also a strategic reason. The SNP will want to keep up a sense of grievance in Scotland against Westminster. So they can never say they are satisfied.
Ed Miliband will never be able to give them enough.
As a bonus for the SNP, this instability in government will make the English (who, let's remember, are the overwhelming majority and pay the bills) more likely to say to the Scots: A plague on you. For God's sake, go.
Lord Ashcroft's latest poll suggests Scottish Labour may be wiped out. But voting for the SNP in this general election will not come without consequences for Scotland.
Melanie McDonagh is upset that the debate "confirmed some unhelpful female stereotypes". More interestingly, she points out that none of these three women is English: an Australian leading a whacko party that's going to bomb in the polls; a Welsh woman leading a party which isn't very popular even in Wales; and a Scot openly determined to hold a Westminster government to ransom.
Stand by for the tail to wag the English dog. Nicola Sturgeon - like Margaret Thatcher, a conviction politician - will make sure that happens.
We saw Nicola Sturgeon's tactic for dealing with issues she doesn't want to discuss. She will start by saying that issue X (say, defence or immigration) is one of the prime duties of government.
She goes on that we can spend much less on defence, and increase the cuddly subsidies. Apparently then everyone will have a first rate education, and there will be no more "poor children" (however you measure that).
Similarly, she says there must be strict immigration controls, and then moves on to enforcing the "living wage". What were these strict controls she was advocating, David Dimbleby wondered. Answer came there none.
In general, the leaders wanted to push their own slogans rather than probe their competitors' offerings. That's why a good interviewer will always be more revealing. But they are few and far between.
Talking of immigration always brings one to Nigel Farage, who was not on sparkling form. Commentators have excused this by saying he wanted to appeal to his core vote by playing the underdog.
He tied the housing shortage to the levels of net immigration, which was unpopular with the audience. But if you want to carry this point you really do have to give broad brush numbers. Our Nigel couldn't be bothered. Lazy boy. He could have used the manifesto's phrase that it's a question of space not race. He didn't bother with that either.
He even said UKIP would prop up a Labour government if it offered a referendum on the EU. After all the work the new political generation in UKIP has put into their manifesto to move beyond the image of UKIP as a single issue party, Nigel can't move beyond what he's been saying for years.
He's starting to remind me of Jean Marie Le Pen. Of course he doesn't believe the Holocaust was a detail of history. But he can't keep up with the change that's taking place in his party.
It would be good to see several constituencies sending a UKIP MP to Westminster. But perhaps not South Thanet.