[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/06/27/art.obamapoll.ap.jpg caption="Obama is up 5 points in the latest CNN poll of polls."](CNN) - Barack Obama holds a 5-point lead over John McCain in the latest CNN "Poll of Polls" - a slight decrease for the Illinois senator from previous CNN polls of polls released earlier this week.
In an average of three recently released national surveys, Obama stands at 45 percent among registered voters while McCain is at 40 percent. Fifteen percent remain unsure about who they will support in November.
In a CNN poll of polls released Thursday, Obama held a 7-point lead over McCain, and the presumptive Democratic presidential was 8 points over McCain in a poll of polls released Tuesday.
But CNN's Senior Political Researcher Alan Silverleib notes McCain's support has consistently hovered around 40 percent.
“While Obama’s lead in our average has fluctuated by a point or two over the last week, McCain has been stuck at 40 percent,” he said. “Heading into the July 4 holiday, McCain is clearly trailing. He has his work cut out for him in terms of changing voters’ perceptions of his candidacy.”
The latest CNN poll of polls included national surveys from Time Magazine, LA Times/Bloomberg, and Gallup.