What will get better traction:
What has Rubio accomplished?
Or
What has Hillary Clinton accomplished?
My bet is the latter. Republicans/TP's love to imply that Hillary hasn't accomplished anything, which wouldn't be worthy of addressing if they didn't say it so much. But if Hill-dog hasn't accomplished anything, than what has Rubio done?
As for slimy Ted Cruz, his victory in Iowa, tainted or not, will likely be his biggest career brag 30 years from now.
So it'll be between Trump and Cruz for the GOP nomination?
Maybe Trump can put him away by saying of Rubio, "He could be a Cuban spy; he might not be. We just don't know!" But that could be a little to subtle for Trump. Something along the lines of, "He's a fucking beaner and he doesn't even deny it!" would sell better in the parts of America where winning two out of three rock-paper-scissors games indicates an intellect worthy of a Nobel Prize.