As outdoor workers in Texas battle extreme heat, U.S. Rep. Greg Casar, D-Austin, launched a daylong “thirst strike” in Washington, D.C., as he pushes for a federal workplace standard that would mandate water breaks for people whose jobs require them to work in the heat. “It’s challenging and it’s hot, but it’s not as hot as it is in Texas,” Casar said as he kicked off the event, during which he’ll forgo water for eight hours.  On Tuesday morning, Casar was joined on the steps of the U.S. Capitol by other lawmakers, labor union members and activists.