To be fair that's a better response than the endless tit-for-tat we've had the past few weeks over pacts. I hate it. It's a pre-judgement of the electorate (much more of an arrogant thing to do than what Cameron said imo), and completely undermines the purpose of their vote; to give a mandate for a party to govern, as a majority. If I want to vote Labour or Tory say, I can't give that with confidence because of the SNP/UKIP pact bickering (and that's just the public stuff; goodness know what talks have already happened behind the scenes). But I can't give a mandate to those coalitions either because they're not formerly campaigning under them and that's not what will be on the ballot!
At least in 2010 all the nonsense really only happened after we knew what the public had decided........not before. And only because the public hadn't given a mandate for any party to govern as a majority - special circumstances, and not trying to figure out the solution before the problem was actually there. I think they should either campaign as coalitions if that's what they think they need to secure their votes, or just shut up about it and get on with, ya know, campaigning with actual policy...........