The marketing hero.
See how he appealed to EVERY group? Ok, let's list it. From the top: he's appealing to Asian Americans, Pacific Islanders, African Americans, Americans abroad (including army personel), Americans with disabilities, rural Americans, environmentalists, gays, small businesses, European and Mediteranian Americans, veterans and military families, women, Republicans, students, and Arab Americans. WHO ELSE IS LEFT? Crazy right wing nuts for Obama? By making himself a part of every group, he gained the majority of votes and subliminally gained unity from all the differences in the American people. Who in normal converstaion or thought would associate environmentalists and small businesses together? Or Republicans and gays? But he did. He unified them all.

Brand consistency.
The symbol was an "O" with disappearing red and white stripes, only varying a little bit to fit a specific organization he wanted to appeal to. Unity in the same symbol, yet uniqueness. Obama brand doesn't pounding the same ole' logo in our heads.

The logo.
Sometimes it looks like a field with a rising sun. Sometimes it's an O for Obama with a patriotic striped design. Sometimes it's the American flag. But all of these work because they make him look good in every way. Patriotic, his name as a symbol, a new beginning, change, etc. It was stuck it on every poster, every bumper sticker, every podium he stood at. It's a simple logo, but it simply means OBAMA.

Lack of boredom.
His symbol isn't boring like other candidates with their entire name as their logo, or their name over the year. That just gets old.