(CNN) – Barack Obama’s advantage over John McCain remains unchanged – but some voters for both candidates seem to be slipping back into the undecided column, the latest CNN Poll of Polls suggests.
CNN Election Center: View the latest state polls
The presumptive Democratic nominee still holds a 5-point advantage over the presumptive Republican nominee in CNN's average of national polls, 46 to 41 percent, with 13 percent of voters surveyed undecided. On Tuesday, Obama held the same edge, 48 to 43 percent over McCain, and 9 percent of voters said they were unsure of their choice.
CNN’s Wednesday survey of major national polls consists of the CBS survey conducted July 31 to August 5, the AP-IPSOS poll conducted July 31 to August 4, and the Gallup tracking poll results for August 3-5. The CNN poll of polls does not have a margin of error.