The media has nothing to do with a success of a third party. Political parties are out for power. America's government is based off the 2 party system. Each party in that system has an all encompassing platform that tries to get as many voters in as possible so they can get as much power as possible. The Democrats and Republicans are more similar than different, as McCain said in his acceptance speech in Minnesota. The D's and R's are only different on a few issues where they can't take both sides. Therefore, both parties are extremely moderate with one leaning slightly left and one slightly right. Third parties only represent people on the extremes of both sides or people with a single issue that they feel that neither party is doing enough for that specific issue (Green Party, socialist party, etc.). Also there are many laws that hold back other parties such as the winner-take-all system and the plurality rule of elections. So basically the two main parties are favored because of how the government in America is structured, compared to proportional representation where if a party gets let's say 10% of the vote they get 10% of the representatives in a senate. Proportional representation favors extremism while our form of electing representatives favors moderation. If you support proportional representation, consider that the Nazi party (a third party) could easily get a few percentage points in a given district and help promote laws that suppress minorities. Whether a Nazi's policies would be better than Obama's or McCain's is pure opinion.