"It's really hard to measure who is productive because nobody is. "

Sen. Marco Rubio offered a tax-overhaul plan two weeks ago, winning plaudits for articulating the kind of vision that could be part of his possible 2016 presidential run.

But turning that plan into law is going to be difficult. For evidence, there’s no need to look further than … Marco Rubio.

Florida’s junior senator, a Republican from West Miami, is in his fifth year as a U.S. senator and has sponsored 63 bills and joint resolutions.

So far, none has been made into law.

Read more at the Miami Herald.