drothgery said:The major political parties in the US are far broader coallitions than are typically seen elsewhere (because the political system strongly encourages two major parties). To UK-ize things ... suppose the LibDems and Labour were both in the same party, and so were the Greens. Then figure any even remotely respectable party of the Right as part of the Tories. And then given them about equal membership nationally, with solid regional strongholds.
Does that help?
Labour & Conservative in the UK are "broad church" parties. Labour includes people who are to the left of any US Democrats. US Republicans include people whose views might not be acceptable in the Conservatives, but I'm not sure about that. Overall I'd say Labour & Conservative were about as broad as Democrat & Republican, although most UK Conservatives would fit comfortably into the US Democratic party.