On FOXNews, Bill Kristol says:

The political system hasn't failed. The Brown government has failed I think. That I think is interesting. If you asked the fashionable liberal editorial page editors and economists and professors who should be in charge three years ago, having a European crisis, the last establishment type, the man they would have picked is Gordon Brown just as Barack Obama is the man they have picked here.
And Gordon Brown and Obama have about the same policies, an unbelievable spending. This is pure Keynesianism on steroids. Now Britain looks like Greece, and now the U.S. is moving in that direction. And the voters have thrown Gordon Brown out. So we now have conservative governments in Britain, France, and Germany.
The welfare state is unsustainable and the voters lost confidence in the left to manage the future of the welfare state, to trim the welfare state and reduce in a way to make something sustainable.
The bad news is David Cameron does not look to be like a Margaret Thatcher or a Ronald Reagan conservative and seems more of a European conservative to not be very bold. But sometimes people surprise when they are in office. It's possible he will.