It's worth remembering the full court press Rubio made on behalf of his bill, especially now that he's running away from it as fast as he can.
Maybe that's why he sweats so much.
Rush Limbaugh comes off looking like a total dupe, but the truth is Limbaugh remained skeptical of yet another promise to secure the border first. As I remember it Rush had to have Rubio on a second time to clarify that.
More generally, the only conservative talk radio show to oppose the Gang of Eight bill consistently and forthrightly was Laura Ingraham's. Nobody on radio has done more to prepare the way for Trump's message on the issue, and to kill the terrible reform efforts of Bush in 2007 and Rubio's in 2013.