Ryan Lizza, How Paul Ryan Captured the GOP: 

Nearly every important conservative opinion-maker and think tank has rallied around his policies. Nearly every Republican in the House and the Senate has voted in favor of some version of his budget plan. Earlier this year, the G.O.P. Presidential candidates lavished praise on Ryan and his ideas. “I’m very supportive of the Ryan budget plan,” Mitt Romney said on March 20th, in Chicago. The following week, while campaigning in Wisconsin, he added, “I think it’d be marvellous if the Senate were to pick up Paul Ryan’s budget and adopt it and pass it along to the President.”

To envisage what Republicans would do if they win in November, the person to understand is not necessarily Romney, who has been a policy cipher all his public life. The person to understand is Paul Ryan.