Gary Johnson

The 63-year-old Libertarian presidential nominee has run 17 marathons and four Ironman Triathlons. He doesn't drink or smoke cigarettes, though his doctor doesn't address his past marijuana use.

The debates will be Hillary Clinton versus Donald Trump — without Jill Stein or Gary Johnson — despite high levels of voter dissatisfaction with the presidential choices.

When Gary Johnson responded, "What is Aleppo?" to a question on MSNBC, he was chided. But, NPR's Scott Simon says, even people who don't draw a blank don't have great ideas about how to fix Syria.

"We want the government out of your pocketbook and out of your bedroom, and the polling shows that a majority of Americans think that," vice presidential nominee Bill Weld said in a CNN town hall.

The last time people were this dissatisfied with presidential candidates, Ross Perot became a third-party success story. This year, however, there are new hurdles for outsiders.