Sorry, IMHO, third parties are pipe dreams.
"All political ideas cannot and should not be channeled into the programs of our two major parties. History has amply proved the virtue of political activity by minority, dissident groups, who innumerable times have been the vanguard of democratic thought and whose programs were ultimately accepted."-- Supreme Court Justice Earl Warren - "Sweezey v. New Hampshire" (1957)
Third parties provide an honorable means of maintaining integrity and voting FOR a candidate who best reflects one's conscience.
If not for third parties, some of us would be forced to pursue a voting strategy of voting for the opposition -- NOT because we actually support them, but as a method of ridding ourselves of incumbents of our own party who have betrayed our principles.