President Barack Obama walks on stage during the final day of the Democratic National Convention at the Time Warner Cable Arena in Charlotte, N.C., on Sept. 6, 2012 Justin Sullivan / Getty Images ...

Worst speech: Barack Obama This speech was a major disappointment for several reasons. For one, it didn't really say anything. He didn't mention one thing he'd do if we gave him a second term.

The former president shot to national fame after making a keynote speech at the DNC in Boston two decades ago.

President Barack Obama made a quick, unannounced trip onto the stage at Time Warner Cable Arena following the speech of Bill Clinton on the second night of the Democratic National Convention.

Democratic presidential candidate Barack Obama made a surprise appearance at the Democratic National Convention after a rousing speech by his vice presidential candidate, Joe Biden.