PRINCETON, N.J. — Barack Obama begins the final week of the campaign with an advantage over John McCain in both Gallup likely voter models, up by 49 percent to 46 percent using the traditional model and leading 51 percent to 44 percent using an expanded likely voter model.
The results, based on Gallup Poll Daily tracking from Oct. 26-28, are essentially the same as in Tuesday's report, and show a slightly closer race than Gallup tracking had reported prior to that.
Wednesday night, Barack Obama used some of his record campaign funds to air a 30-minute campaign advertisement on most major television networks. Any possible impact of the ad on voter preferences will be apparent in the coming days. Gallup has only found about 4 percent of likely voters to be truly undecided at this late stage of the campaign, in that they do not express a preference or leaning for Obama, McCain, nor some other candidate.
Obama has a slightly larger lead among the pool of all registered voters, currently at 51 percent to 42 percent. These percentages have been stable throughout October, and the current figures precisely match the average for the month to date.