Ted Cruz and Marco Rubio battled on Sunday over which GOP candidate offered the most viable alternative to billionaire Donald Trump, the decisive winner in South Carolina’s Saturday primary. Rubio, who edged out Cruz for second place, attracted 3,000 supporters at a rally in Tennessee, the biggest crowd of his campaign. “Last night was truly the beginning of the real Republican primary,” Rubio said on CNN. Cruz, who won the Iowa caucuses, said, “If you want to beat Donald Trump, you’ve got to go with the only campaign that has demonstrated that they can beat Donald Trump.”