New York City Mayor Bill de Blasio after failing to qualify for Thursday's Democratic debate is crossing his fingers his campaign's turning point is just around the corner. Ahead of the third 2020 debate, NBC News spoke with some of the Democratic candidates who weren't invited because they didn't reach two percent support in four qualifying polls and reach 130,000 unique donors, including de Blasio, who has generally been polling at between zero and one percent nationally. So what compels someone like de Blasio to even stay in the race, NBC wondered? At a recent event, the New York City...