"Is a Third Party Vote a Waste?"

This week, Andy & Brendan interrogate a popular supposition about the United States' purported two-party system. 

Does any party "deserve" you vote? Is voting for a third party candidate "stealing" from some other candidate with a larger bankroll? What arguments are tenable that a third party candidate is a "spoiler campaign" for a more likely victor? Is Voting like sports betting or is it an ethical obligation wherein one selects the 
best candidate possible (regardless of "odds")?

What do YOU think?