Paul D. Ryan

Ryan, having campaigned alongside Mitt Romney during this year's presidential race, will be inseparable from the 2016 discussion. Ryan, who has been a rising star within the GOP, built a reputation for his focus on budgetary issues. Though he didn't emerge from the 2012 campaign unscathed, the Wisconsin congressman retains his status as the chairman of the House Budget Committee, and he would shock many were he not to run in 2016. Ryan most recently told the Wisconsin State Journal that he has "decided not to decide" on a presidential run.
Mary Altaffer / Associated Press
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