I live in a state where the presidential race is locked in, and has been for my entire life. I know which party is going to take all of our electoral votes, every single time, no matter what I do. If I vote for a third party and help them get 20% of the popular vote (however unlikely that is) they’ll be guaranteed a spot in the debates and on the ballots of all 50 states in 4 years. Its the only way for my vote to potentially matter at all.