Who would want to be in power for the next five years? Its not going to be pretty as the economic mess starts to get sorted out. I mean no one is even talking about how to reduce the debt, only the amount by which we get further into debt each year i.e. the deficit.
Even reducing the deficit will be at least a little painful for every single person living in Britain. The public are bound to blame whoever is in power at the time and they'll find it hard to overcome the prejudice in future elections.
If I were in charge of the labour party or the conservative party today, I'd be hoping for a narrow defeat so that my party could keep its reputation and hopefully win several elections in the future. If i was directing the lib-dems though, I'd probably be glad for any breakthrough even if it does result in winnign a poisoned chalice!
Then again, maybe they really are patriots and believe they can do good, but then I think "expenses scandal", so patriotism doesn't seem very likely.