Posted Friday, March 15, 2013, at 3:01 PM
WASHINGTON, DC - DECEMBER 20: Senator Rob Portman (R-OH) speaks with reporters outside of Speaker John Boehner's office, on Capitol Hill, December 20, 2012 in Washington, DC. House Republicans called off plans to vote on Boehner's 'Plan B' Fiscal Cliff plan. (Drew Angerer/Getty Images
Portman's new stance is a departure for the man who once backed a federal amendment to ban gay marriage and whose staunch anti-gay views caused 100 University of Michigan Law students to walk out on his 2010 commencement address.