Democratic National Convention
United States presidential candidate Barack Obama's lead in the polls has increased by 3.3% over John McCain since the 
. Last week, the two candidates were statistically tied. Now, Barack Obama is polling at 49.0% and John McCain is polling at 44.1%, a 4.9% lead, according to the latest "Day to Day Politics Poll Average". The margin of error for the poll average is at 0.93%. 
US presidential candidate Barack Obama's lead increases after Democratic National Convention