I just gave a rather long explanation about how I can say that in the post you replied to.
The media ignores third party candidates because it is the logical thing to do in our current political system. Voters who think logically will also ignore these candidates.
They "founding fathers" did a great job constructing a democracy without much to go off of, but there are some negative consequences to the system they devised that they could not have foreseen. These design flaws have since been fixed by other countries, who had the benefit of looking at American and seeing what worked and what didn't. Using a first past the post system with a district magnitude of 1 has the negative consequence of the country only having two parties. This is fixed by systems such as proportional representation, which allow for multiple parties.
It's not the media's fault that our country doesn't have a proportional representation electoral system.
If you're not sure why this happens, it's really not that complicated. Only one person can win. Lets say there are 4 parties on a spectrum of 1-10, with 1 being conservative and 10 being liberal. They may be something like 2, 4, 6, and 8. If you are a liberal voter, you have to choose whether or not to vote for 6 or 8. If you are a strong liberal, you would like to vote for 8. The same applies on the conservative side. Now, what happens if the liberals all vote for who they actually want to win: half vote for 6 and half vote for 8, but 6 also picks up swing voters by being in the middle, knocking 8 out of the race. Now, lets say the same thing happens on the conservative side, 4 is the victor. So the election comes down to who happened to get more votes, 4 or 6.
Lets pretend that 6 won that election. In the next election, conservatives get smart and decide to all vote for 4, ignoring 2. If the liberal do not do the same thing, 4 will win by a landslide, as the liberal vote is split between 6 and 8. In the next election, you can be certain both groups will vote for 4 and 6, 2 and 8 are ignored. Do this for 100 years, and you end up with two parties.