As an outsider looking in, I have to question the assumption of a 'landslide'. Obama won in a two-horse race between a lacklustre man of integrity and a charismatic black man. And I am sorry to say that that last point probably did more for him than any other factor.
The Democrats had a choice to make to beat McCain: Play the gender card with Clinton or the race card with Obama. In the end, they cynically decided that the race card would trump the gender agenda and they were vindicated at the ballot box.
I absolutely detest and despise prejudice in whatever form it appears, be it on grounds of race, creed, gender, sexual orientation or anything else, but fairness cuts both ways, which means I do not approve of favouring any candidate simply because he is black or she is a woman, any more than if they were rejected for those reasons, and I am afraid that although Obama seems a fairly nice guy (for a politician) he owes his office more to his melanin than his political acuity. He promised almost everyone in sight almost everything they desired and that is very dangerous.
Throughout the early 20th Century, Britain held the Palestinian Mandate and promised both the Arabs and the Jews the same land, and look where that got us.
Adolf Hitler was a charismatic leader who won a democratic mandate at open elections, so democracy has its limitations - and the United States is not even a democracy. Check it out - you're a 'Republic', which is one reason you have the Elctoral College system.
I fear for Obama and sincerely believe that an attempt will be made on the life of this basically decent and well-meaning man within the next 3 to 10 months.