Worsening jobs figures, Romney's ad blitz and low approval ratings are reasons for Obama not to be complacent.
Like the Democrats in 2004, the Republicans have over-estimated their instinctive appeal to voters.
US president opens up a five-point lead over Romney in latest national poll.
The first in a series of campaign reports from Hicksville, Ohio.
On stage, Obama spoke truth from power - the essential task of a political leader.
On foreign policy, the Republican candidate and the US President share a method and a worldview.
Barack Obama on Mitt Romney's Olympics gaffe.
Michelle Obama on what she's learned from her husband's presidency.
Romney remains insecure about his conservative support.