Rubio, Demings face off in lone Senate debate

U.S. Sen. Marco Rubio and U.S. Rep. Val Demings greet each other before a televised debate on Tuesday. (THOMAS CORDY/Palm Beach Post via AP)
U.S. Sen. Marco Rubio and U.S. Rep. Val Demings greet each other before a televised debate on Tuesday. (THOMAS CORDY/Palm Beach Post via AP)

MIAMI — Democratic U.S. Rep. Val Demings went on the attack Tuesday in her first debate against Republican Sen. Marco Rubio, castigating him as a serial liar, while Rubio criticized her for supporting…