As Democratic Party leaders assessed their vulnerabilities in this year’s midterm elections, the one state they did not worry about was New York. That — it turns out — was a mistake. Despite being a blue state through and through, and a place President Donald J. Trump lost by 23 points two years ago, the red tide of this moment is lapping at New York’s shores. Why is New York up for grabs? Guest: Nicholas Fandos, a Metro reporter for The New York Times.