House Speaker John Boehner, R-Ohio (left) and Senate Minority Leader Mitch McConnell, R-Ky., on Capitol Hill in February. Republicans have been quick to criticize the president for bypassing Congress with his immigration action, but they've been unusually silent on the policy itself. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

President Obama addresses a joint session of Congress while delivering his State of the Union speech in 2011. During his first two years in office, Obama used big Democratic majorities in Congress to muscle through major legislation, but since the 2010 midterm elections, he's increasingly been stymied by a wall of GOP opposition. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Critics say U.S. Supreme Court Chief Justice John Roberts, shown in 2010, backtracked on previous pledges to give high priority to precedent in the Citizens United campaign finance case. Paul J. Richards/AFP/Getty Images hide caption

itoggle caption Paul J. Richards/AFP/Getty Images

Mitt Romney, then the governor-elect of Massachusetts, walks into the House chambers during inaugural ceremonies at the Statehouse in Boston, on Jan. 2, 2003. Elise Amendola/AP hide caption

itoggle caption Elise Amendola/AP

Mitt Romney shakes hands as he walks into the House Chambers during inaugural ceremonies at the State House in Boston in 2003. the Obama campaign sought to focus attention on Romney's tenure as Massachusetts governor. Elise Amendola/AP hide caption

itoggle caption Elise Amendola/AP

President Obama talks to German Chancellor Angela Merkel, French President Francois Hollande (upper left), NATO Secretary-General Anders Fogh Rasmussen (center) and other leaders during the official photo at Soldier Field in Chicago during the NATO summit Sunday. Jim Watson/AFP/Getty Images hide caption

itoggle caption Jim Watson/AFP/Getty Images

Caroline Maya, a 21-year-old college student, registers to vote for the first time at the Latinos for Obama booth outside the Grand Sierra Casino in Reno, Nev., Saturday. David Welna/NPR hide caption

itoggle caption David Welna/NPR