The U.S. voting system is screwed up. How can Americans have freedom of choice when their choices are limited to two candidates who don't represent them? The Republican and Democratic parties have become so wealthy and powerful that they hedge out any and all competition with little effort. It's not quite a political monopoly, since there are two competing parties. It's an oligopoly.
There are numerous third party groups: The Green Party, The Libertarian Party, The Reform Party, and more. But their candidates are not allowed into the presidential debates, and not included in "equal time" laws.
We're so locked into a two-party system, and compelled to vote for the lesser of two evils that most of us never even consider third party options. CNN has an excellent synopsis of third parties, and a good summary of Ralph Nader.
Adding parties (choices) is a option that, it seems to me, would have the effect of fragmenting the vote so that one could win an election with a small number of votes. Candidates could calculate the percentage of solid votes they expect, then win simply by driving votes to three or four other parties. With, say, five parties, 25% of the vote would ensure a win for any candidate able to split the remaining 75% more or less evenly among the other four parties. There are analysts who claim that Ralph Nader cost Gore the election simply be stealing enough votes to let Bush win with what he already had. Bush didn't need more votes -- he just needed Gore to get fewer votes. Who's to say that Bush's campaign wasn't behind a strategy of driving voters who would never vote for Bush over to Nader? It really wouldn't matter who they voted for as long as they didn't vote for Al Gore, right?
Understand that I am not defending (or attacking, for that matter) the so-called "Two-party" system, but simply pointing out that by increasing the number of choices, one could well wind up in an even worse mess than currently exists.
I wonder if a possible solution might be to find some way to "encourage" parties to choose better candidates? Perhaps we should be taking a closer look at the mechanism by which one gets a Party nomination in the first place.