FILE - In this Nov. 6, 2012 file photo, Sen. Claire McCaskill, D-Mo. is seen in St. Louis. For years, American opinion on gay marriage has been shifting. Now Washington is tripping over itself trying to catch up. In less than two weeks, seven sitting senators _ all from moderate or Republican-leaning states _ announced their support, dropping one by one like dominos. Taken together, their proclamations reflected a profound change in the American political calculus: For the first time, elected officials from traditionally conservative states are starting to feel it's safer to back gay marriage than risk being the last to join the cause. (AP Photo/Jeff Roberson. File)

Associated Press
FILE - In this Nov. 6, 2012 file photo, Sen. Claire McCaskill, D-Mo. is seen in St. Louis.  For years, American opinion on gay marriage has been shifting. Now Washington is tripping over itself trying to catch up. In less than two weeks, seven sitting senators _ all from moderate or Republican-leaning states _ announced their support, dropping one by one like dominos. Taken together, their proclamations reflected a profound change in the American political calculus: For the first time, elected officials from traditionally conservative states are starting to feel it's safer to back gay marriage than risk being the last to join the cause. (AP Photo/Jeff Roberson. File)
FILE - In this Nov. 6, 2012 file photo, Sen. Claire McCaskill, D-Mo. is seen in St. Louis. For years, American opinion on gay marriage has been shifting. Now Washington is tripping over itself trying to catch up. In less than two weeks, seven sitting senators _ all from moderate or Republican-leaning states _ announced their support, dropping one by one like dominos. Taken together, their proclamations reflected a profound change in the American political calculus: For the first time, elected officials from traditionally conservative states are starting to feel it's safer to back gay marriage than risk being the last to join the cause. (AP Photo/Jeff Roberson. File)
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