Over a year ago, democratic socialist Zohran Mamdani won the Democratic nomination and went on to become the mayor of New York City. Now, his influence is spreading. Progressive and democratic socialist candidates endorsed by Mamdani have toppled established Democrats in New York and Colorado. But will this new way of doing politics connect with voters across the country?Nour Haydar speaks with Washington DC bureau chief David Smith about if the Democrats are still fit to take on Trump