Gallup Daily: Obama-Biden Ticket Leads by 6 Points: No further increase for Obama since before Thursday's speech

Gallup Poll Daily tracking from Aug. 28-30, including two days of interviewing since the close of the Democratic National Convention, finds Barack Obama with a six percentage point lead over John McCain in the presidential contest, 48% to 42%.

Though down slightly from the eight-point lead Obama held mid-convention, this represents a clear improvement for the Democratic candidate's positioning in the campaign compared to a week ago when the race was about tied.