Barack Obama: “It's going to make a real difference for our economy.”

it was nevertheless important that we all play a part in assuring that our elected officials are accountable.

The success of this experiment was never a given.

Every president here today, as different as we are, has tried our best to uphold the values that John McCain and Mitt Romney believed in no less than I did.

helped lead some of the most significant movements for change in human history