A recent NBC News/Quinnipiac poll reveals that more than a quarter of young voters—many who had supported the presidential bid of Sen. Bernie Sanders—plan to cast their presidential ballots for Libertarian Party candidate Gary Johnson. Democrats are increasingly nervous that Johnson’s candidacy could pull more voters from Hillary Clinton than from her Republican rival, Donald Trump, especially in key states like Colorado and Wisconsin. While Green Party presidential candidate Jill Stein draws mostly progressive voters, Johnson’s support hails from the breadth of the political spectrum, making it more difficult to suss out. However, because he is on the ballot in all 50 states (Stein is not), most pollsters consider his campaign to be a greater threat to Clinton’s chances in some swing states. And because the U.S. uses the electoral college system to determine the outcome of presidential elections, that could matter on November 8, no matter Clinton's overall support among the general population.