I don't think Obama was an aberration as much as he was just an extremely great politician. He has a rare combination of charisma, intellect, and self control that's pretty rare in recent presidential candidates. This is why even when the economy was in the pooper, the majority of Americans still liked him as a person. If the economy is still in good shape by election time, I just don't see how anyone beats him. In fact, if the economy is in good shape, he's going to win by a pretty large margin.
To go a step further, even if the economy isn't doing great by the fall, the money should still be on Obama to win the election. He dismantled the Clinton machine, and won the election with an Islamic name that rhymes with two symbols of America's war on terror only seven years after 9/11. A lot of people say he has a record now, but people forget that he won the election with no real record, and as a black man with an Islamic name.
Yeah, and he won VA, NC, and IN too, something no one expected to happen in 2008.
I'd be shocked if by 2020 Obama isn't considered one of the greatest presidents in American history. Right along with Lincoln, Washington, and Roosevelt.