(CNN) - Sen. Barack Obama, the presumptive Democratic nominee, is leading in the battleground state of Michigan, according to a poll released Friday.
Obama leads Sen. John McCain, the presumptive Republican nominee, by 7 percentage points – 46 percent versus 39 percent. In the survey, 12 percent said they were unsure about their choice for president, 2 percent supported Ralph Nader, and 1 percent backed the Libertarian Party's Bob Barr.
The Detroit Free Press/Local 4 poll of 600 likely Michigan voters was conducted August 17-20 and has a margin of error of plus or minus 4 percentage points.
CNN considers Michigan a toss-up state. Click here to see CNN's Electoral Map.