Calculus behind Obama shift on gay marriage
VideosGay couple: 'Full of joy' Gay marriage supporters praise Obama Obama: Gay couples should be able to marry
GalleriesSame-sex marriage becomes law in New York Same-sex couples marry around New York New York Governor Andrew M. Cuomo
Web linksBlog: The Spin Cycle
President Barack Obama's political calculus is clear.
His newly stated support for same-sex marriage could energize some Democratic Party activists. And it may illustrate a wider strategic effort to keep Mitt Romney from grabbing the perceived political center as he emerges from the Republican primaries.
That center shifts -- sometimes so dramatically that a formerly fringe idea grows...