Greens or Libertarians...Greens have been doing well in other countries. I could see them getting elected in some congressional districts on the west coast. WA-7 and whatever districts are Portland, SF, and LA. The Green in WA-7 got 20% of the vote in 2000...The Libertarian got 7% and the democrat got the other 73 or so percent. Although I believe hes a longtime and popular incumbent.
The Libertarian Party has major party status because they got at least 5% of the vote in a statewide race in an even number election year. Ruth Bennet it was, got 7% of the vote in some race. I think 3 other libertarians got 5-6% too.
http://www.lpws.org/candidates/libertarians_in_office.htmNothing too impressive. Greens could come a major party too. Nader almost got them it when he got 4.14% of the vote 4 years ago. I believe they've gotten a few high positions in Seattle (super intendent(sp) of the Seattle School District is held by a green, I think).