OVER the past year, the main story line in the push for marriage equality has been the ardor and success with which leading Democratic politicians have taken up the fight. The Democratic governors of New York, Maryland and Washington all promoted and signed same-sex marriage laws, for which President Obama expressed his support last month.

But the progress within Republican ranks has also been pivotal, not to mention fascinating. And a compelling character in that subplot just added a new twist to the narrative, one that suggests the rapidly changing political dynamics of this issue and its potential import to a party dogged by an image of being culturally out of touch.

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