Apparently, under Washington law, the Republican party doesn't qualify as a "major" political party this year because they didn't run a candidate for Senate in 2010. They then failed to file the necessary paperwork to get Romney on the ballot. Oops. You think the courts will enforce the law as written?
http://slog.thestranger.com/slog/archives/2012/08/16/libertarians-sue-to-have-romney-kicked-off-washington-ballot