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Associated Press
FILE - In this Sept. 17, 2012 file photo, Sen. Jon Tester, D-Mont. speaks in Billings, Mont.  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/Matt Gouras, File)

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