Blame? Thats a liberal issue my man. I wont "blame" anyone. I will tell you that at this point in history, a 3rd party is not going to win a Presidency.
Now, if a 3rd party was to become organized, win elections at the local and state level, have a fair number of actual members of the party elected to Congress (lets say 10-15%), have actual members of the party considered for SCOTUS positions, etc. THEN MAYBE a 3rd party would work. A 3rd party President at this point will be a lame duck and get jack shit done. He will not be respected by either Dems or GOP and the public at large will see him as a charlatan. A vote for a 3rd party President is not a vote for change, its a vote because your being a pissy little brat.

Personally, the 3D party sounds exactly like a Conservative who cannot deal with the reality of modern life, and who wants to go back to the pioneer days. I have yet to talk to a third party supporter who had a real clue about taxes other than "flat tax" or other sweeping generalizations, and who really can only spout off a bunch of generalizations about reducing goverment (hey sounds like a Republican platform!) with no actual method to do it besides radio show commentary of "get rid of all government agencies- why do we need a Department of Agriculture or bla blah blah"- yeah, theres a solution in there somewhere.

Third party supporters keep trying to maintain that both the existing parties are the same, and they are wrong and absolutely close minded when it is suggested they actually look into the policies and history they are basing their opinions on.

Full Disclosure- one of my good friends is a Libertarian, and we argue back and forth a lot. I cant change his belief, and he cannot find enough facts to get me to support his.