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.Background reading: