It’s St. Patrick’s Day in Chicago, and JB Pritzker is on a boat cruising down the city’s green-dyed river. An icy breeze whips beer cans across the deck as the Illinois governor takes a swig of Redbreast whiskey from a flask offered to him by a bagpiper. Weaving through the crowd, he mingles with the tipsy guests, talking housing policy with a visiting Irish diplomat, joking that they don’t make kilts in his size, and chatting up the members of the holiday parade court.  Even here on the party boat, the city awash in festive green, President Donald Trump is not far from minds. Colleen Kelch, a marketing professional and member of the queen’s court, grows serious as she details Pritzker’s battles with Trump and his defense of LGBTQ people in the state. “He fights for us,” Kelch says.  As he campaigns for a third term, Pritzker is riding his battles with the President to national prominence.…