economy? how big a role it will be in 2020 and the democrats plan to counter it. plus 50 years after the first men walked on the moon. new this morning two-thirds of the country dealing with sweltering temperatures all weekend from the midwest to new england. the excessive heat warnings feel worse because of that high humidity. chicago has seen temperatures in the 90s but feels like 111 degrees. the dangerous heat has left one person dead and former nfl player mitch petric died from heat stroke yesterday after spending the day working outside. nbc's kathy park is in new york city where the heat is so bad the city cancelled its triathlon. let's get first to jessica webb. when do we get a break. >> we have a cold front making its way through the upper midwest. over the next 36 hours steaming hot for two-thirds of the