Well...I must say I'm surprised by your response. I thought, surely, that someone who defends Obama would know about him...but on second thought, you don't actually defend him. You only attack his opponents.
Anyway, this is how it happened:
He became a State Senator, not by winning his nomination, but by knocking his opponents out of the race. He got the nomination by default. When he ran for U.S. Senator, he got his Democratic opponents divorce papers exposed, causing him to withdraw. Again, he got his nomination by default. The then pulled the same trick on his Republican opponent, causing him to withdraw and the Republican replacements was so inept, Obama cruised to an easy victory.
Chicago political tactics at its best.
Now...in his previous and current Presidential races, he obviously can't make his opponents withdraw...but he didn't...and now doesn't...hesitate to try to smear his opponents in any way possible.
More Chicago political tactics.
He had an easier time with McCain...in large part by connecting McCain to Bush. He's having a harder time with Romney...but he's trying his best. Witness the current taxer tactics.
Bottom line: Obama has never won a race based solely on his qualifications and positions. He has always used sleazy Chicago political tactics.
You know, haymarket...some people would charge good money for providing an education. You're lucky I don't need your money and that I'm doing it for free.