Senators Lisa Murkowski, an Alaska Republican, and Ron Wyden, an Oregon Democrat, discussing their new campaign finance legislation at an April 23, 2013 Capitol Hill news conference. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

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