FILE - Republican presidential candidate, Vice President George Bush , right, and his running mate Sen. Dan Quayle, R-Ind., wave to the assembly of the Republican National Convention in New Orleans on Aug. 18, 1988. A new CNN Films documentary explores the role of the U.S. vice presidency, which in modern times has emerged into a more powerful position. Still, the film notes that a veep’s duties are all up to the president. (AP Photo/J. Scott Applewhite, File)