Despite all of the evidence that Barack Obama has a great advantage for re-election in 2012, there certainly are factors which could lead to his defeat.
If the economy has another backslide of notable proportions, and gasoline prices continue to rise.
If a war breaks out in the Middle East or elsewhere, and the President is seen as handling the foreign crisis poorly.
If the Republican attempt in many states to limit the vote by discriminatory voter registration legislation succeeds in cutting voter registration and participation down dramatically.
If the enthusiasm of voters for Barack Obama is toned down, because of disillusionment that he has not been able to solve all of the problems he faced upon taking office.
If the effects of the growth of SuperPACS, encouraged by the Citizens United Case of the Supreme Court in 2010, are able to propagandize enough with less informed voters who react to negative commercials.
If a major political scandal erupts that undermines faith in the President’s leadership, with the opposition already starting to blame Obama for the Secret Service scandal.
And finally, the issue of race, as electing the first African American President is a path breaker and milestone, but re-electing would be an even more path breaking milestone, with the constant reference to race by right wing extremists, conservatives, and a majority of Republican officeholders, all designed to instill fear, panic, and conspiracy theories into the heads of white working class voters in Pennsylvania and the Midwest.
So there is no guarantee, and six months is an eternity in American politics!