FILE - In this Aug. 29, 2012, file photo, Sen. Rob Portman, R-Ohio, waves to the delegates during the Republican National Convention in Tampa, Fla. Portman said Thursday, March 14, 2013

 

              FILE - In this Aug. 29, 2012, file photo, Sen. Rob Portman, R-Ohio, waves to the delegates during the Republican National Convention in Tampa, Fla. Portman said Thursday, March 14, 2013
FILE - In this Aug. 29, 2012, file photo, Sen. Rob Portman, R-Ohio, waves to the delegates during the Republican National Convention in Tampa, Fla. Portman said Thursday, March 14, 2013 that he now supports gay marriage and says his reversal on the issue began when he learned one of his sons is gay. Knowing someone who is gay or just getting older and thinking about the issue are two big reasons the country is viewing same-sex marriage more favorably, according to a national survey. The Pew Research Center poll helps explain why Americans seem to be changing their minds on the issue and follows the recent public embrace of gay marriage by Democrat Hillary Rodham Clinton and Portman. (AP Photo/J. Scott Applewhite, File)