Do you think there's a chance for any party to challenge the Democratic Party or the Republican Party in the next 10 years?

Not until we get rid of the "lesser of two evils" mentality among voters. There are people who would vote for a candidate whose platform is more in line with their own thoughts, but they feel like they are "throwing away their vote" if they do so, because they believe that only a Democrat or Republican can win. What needs to happen is for people to look at VoteSmart.org and other sources and find a candidate they can really stand behind, and vote for that candidate. And we have to be willing to take the chance that a Ross Perot or Ralph Nader or just a sprinkling of votes among several obscure candidates will throw the election toward a candidate we don't want. Maybe then some third (and fourth!) parties will emerge that more closely represent what the people really want, but it will take more than ten years.