Hmmm. I'm in two minds about this. I would agree there are failures with the political bodies engaging with the electorate (though I'd undoubtedly disagree with some on this site over where those failures are) and would like to see changes to the electoral system.
However, there's a danger that this might create a system in which vast public resources are expended on issues because of the whims of vocal minorities. This might be the Countryside Alliance, Hunt Sabateurs, Christians, Muslims, Environmentalists, Heavy Metal Fans or whatever. HAving just seen jno's answer (posted whilst I was writing this) newspapers would undoubtedly be another.
Surely the electorate would be more open to manipulation. Do we really want government on the basis of who can afford the largest propaganda/PR campaign?
Ultimately, I'm sure people's feeling on this would be determined by whether the general public's voting reflected their own prejudices.