3rd party

What the future holds for our country will not be determined until at least 2 years into Barack Obama's presidency. But by the end of his term I hope people realize that between two parties, there can be no resolution.
The infamous 3rd party candidates are always treated as second class citizens and rarely given an opportunity to actually have a chance of gaining support.
Why on a voter registration card must one be required to check between A. Democrat B. Republican or C. Other?
I say if this country we live in were actually a democracy and allowed all voices to be heard it would have one blank line where voters would write in their own affiliation, not to be suaded to choose between 2 and be "different" by filling in "Other".
It is a double standard that not all parties are treated equally and I believe it will be a downfall in years to come.