Former GOP vice presidential nominee Rep. Paul Ryan, R-Wis., now supports the rights of gay Americans to adopt children, though he still believes marriage “is between a man and a woman.” In a town hall meeting with constituents in Wisconsin on Monday, the House Budget Committee chairman said he has changed his mind on the adoption issue, even though his opinions on other aspects of gay rights have remained unchanged. To date, two Republican senators — Rob Portman of Ohio, who had been in the mix for Mitt Romney’s No. 2 spot, and Mark S. Kirk of Illinois — have...