Supporters of Alan Gross, seen on poster at left, hold an event to mark his fourth year in prison in Cuba, Tuesday, Dec. 3, 2013, in Lafayette Park across from the White House in Washington.

AP Photo/Charles Dharapak

Supporters of Alan Gross, seen on poster at left, hold an event to mark his fourth year in prison in Cuba, Tuesday, Dec. 3, 2013, in Lafayette Park across from the White House in Washington.