FILE - In this June 8, 2012, file photo, San Antonio Mayor Julian Castro gives the keynote address at the Texas Democratic Convention in Houston. Castro has been tapped by the Democrats

 

              FILE - In this June 8, 2012, file photo, San Antonio Mayor Julian Castro gives the keynote address at the Texas Democratic Convention in Houston. Castro has been tapped by the Democrats
FILE - In this June 8, 2012, file photo, San Antonio Mayor Julian Castro gives the keynote address at the Texas Democratic Convention in Houston. Castro has been tapped by the Democrats for the high-profile spot of keynote speaker at the Democratic National Convention in Charlotte, N.C., the first Hispanic keynote speaker. Long gone are the passionate debates. Long gone is the suspense about who will emerge as the party's presidential nominee. Political conventions now are carefully scripted pep rallies aimed at a national TV audience. Not since the 1970s, in fact, has the nation had a major-party national convention begin with the nominee in doubt. Americans already know how the story will end at this year's Republican and Democratic national gatherings. So have modern-day conventions become irrelevant? (AP Photo/Pat Sullivan, File)