The two historically unpopular likely major party nominees have some frustrated voters daydreaming about a third party. But as in most election years, the prospects for such a candidate are mostly a fantasy when it comes to winning the White House outright. A mix of structural challenges such as ballot access in states and rigorous requirements to enter the general election debates, the Electoral College, and the lack of a clear ideological opening make this talk little more than a protest. Still, that doesn’t mean a third-party candidate can’t play a role as a spoiler, swiping votes that might otherwise go to Hillary Clinton or Donald Trump. Here’s a look at five potential third-party scenarios and how they might affect the November election.