Thinking about the scenario where Johnson and/or Stein would actually carry a state or two. I know it's not likely but still a scenario to think about. I wonder how many people have actually read the US Constitution? People who see no harm in voting for a third party need to read and think about the 12th Amendment to the US Constitution. If no candidate gets a majority of Electoral College votes then the decision goes to the US House of Representatives to chose among the top 3 vote getters. The Senate gets to chose the Vice-President from the top two VP vote getters. So if Hillary Clinton only gets 269 or less of the total 538 Electoral College votes, then the House of Representatives gets to chose who they want, and they can and with the current makeup of the House, will ignore the popular vote and chose the most right wing candidate, either Trump or Johnson.
Hillary Clinton is the most qualified of any candidate, having served as First Lady, Secretary of State and the US Senator from New York. Much thanks to Bernie Sanders we have the most progressive platform since 1932. But if any third party candidate manages to win any states Electoral votes, then even if Hillary wins a majority of votes and a plurality of the Electoral votes, the election results become moot.
Jill Stein will be lucky to get 5% of the vote and will serve as nothing but a spoiler. And Stein has zero qualifications for the job. She has only served as a town council member. Gary Johnson has a better chance but he is a Libertarian follower of Ayn Rand. They believe in the smallest government possible. With a Libertarian President expect a Lord of the Flies existence where everyone is on their own. What is left of the social safety net would be privatized or removed completely.
Amendment XII
The electors shall meet in their respective states and vote by ballot for President and Vice-President, one of whom, at least, shall not be an inhabitant of the same state with themselves; they shall name in their ballots the person voted for as President, and in distinct ballots the person voted for as Vice-President, and they shall make distinct lists of all persons voted for as President, and of all persons voted for as Vice-President, and of the number of votes for each, which lists they shall sign and certify, and transmit sealed to the seat of the government of the United States, directed to the President of the Senate;--The President of the Senate shall, in the presence of the Senate and House of Representatives, open all the certificates and the votes shall then be counted;--the person having the greatest number of votes for President, shall be the President, if such number be a majority of the whole number of electors appointed; and if no person have such majority, then from the persons having the highest numbers not exceeding three on the list of those voted for as President, the House of Representatives shall choose immediately, by ballot, the President. But in choosing the President, the votes shall be taken by states, the representation from each state having one vote; a quorum for this purpose shall consist of a member or members from two-thirds of the states, and a majority of all the states shall be necessary to a choice. And if the House of Representatives shall not choose a President whenever the right of choice shall devolve upon them, before the fourth day of March next following, then the Vice-President shall act as President, as in the case of the death or other constitutional disability of the President. The person having the greatest number of votes as Vice-President, shall be the Vice-President, if such number be a majority of the whole number of electors appointed, and if no person have a majority, then from the two highest numbers on the list, the Senate shall choose the Vice-President; a quorum for the purpose shall consist of two-thirds of the whole number of Senators, and a majority of the whole number shall be necessary to a choice. But no person constitutionally ineligible to the office of President shall be eligible to that of Vice-President of the United States.