WASHINGTON — Sen. Bernie Sanders, I-Vt., is defending Senate candidate Graham Platner following news reports that the presumptive Democratic nominee in Maine exchanged sexually explicit texts with women at the beginning of his marriage. Sanders, who has endorsed Platner in his bid to unseat GOP Sen. Susan Collins, said that working families face bigger issues than Platner’s marriage. “We got a housing crisis. People can’t afford healthcare, they can’t afford groceries, they can’t afford to fill