In this frame grab from video, Sen. Marco Rubio, Florida Republican, takes a sip of water during the GOP response to President Obama's State of the Union address on Tuesday, Feb. 12, 2013, in Washington. (AP Photo/Pool)

Photo by: uncredited

In this frame grab from video, Sen. Marco Rubio, Florida Republican, takes a sip of water during the GOP response to President Obama's State of the Union address on Tuesday, Feb. 12, 2013, in Washington. (AP Photo/Pool)