"Serving as a U.S. Congressman has been the greatest honor of my life," Wu said in a statement. "There is no other job where you get up each day and ask, 'How can I try to make the world a better place today?'" "Particularly meaningful to me has been working for more and better investments in science and education," Wu said. "Also, I believe that my support for people who struggle for human rights and civil liberties will ultimately bear fruit in a world that is more just and peaceful." "However great the honor and engaging the work, there comes a time to hand on the privilege of elected office -- and that time has come," Wu said.