Does anyone think a centrist party similar to the Lib-Dems in the UK could work as a third party in the US?
The Democrats are in many ways already a centrist party, there support embraces a pretty big spectrum that in this country would range from the left of the tory party to the green party, but the dominant figures, at least recently, such as the Clintons and Barack Obama would be more likely to be a Lib Dem or even Conservative in the UK than Labour. So a centrist party would be pretty much the same to the Democrats in many areas.
Also, the Lib Dem base at its height was just as much a function of being a 'none of the above' party than there actual policies, hence why there support was concentrated in those areas furthest removed from Westminster, like SW England, and the Highlands of Scotland. There are similar areas of America, but they are usually well to the right. Therefore, if a party with a similar appeal to the Lib Dems came into existence, it would likely be a right wing and primarily southern party, even though the two parties would practically be the antithesis of one another.