Oregon Sen. Ron Wyden, a Democrat, (left) and House Budget Committee Chairman Paul Ryan, a Wisconsin Republican, present their plan for changing Medicare at the U.S. Capitol Thursday. Tom Williams/Roll Call/Getty Images hide caption

itoggle caption Tom Williams/Roll Call/Getty Images

Rep. Paul Ryan (R-WI) at NPR headquarters in May. Erin Schwartz/NPR hide caption

itoggle caption Erin Schwartz/NPR