Obama leads in four swing states

Barack Obama leads John McCain in four battleground states for the fall -- by narrow margins in Colorado and Michigan, and by double digits in Minnesota and Wisconsin, according to new polls released today.

Buttressing Obama's nationwide strategy to break into traditionally Republican states, he is up 49 percent to 44 percent among likely voters in Colorado, by 48 percent to 42 percent in Michigan, by 54 percent to 37 percent in Minnesota, and 52 percent to 39 percent in Wisconsin.

President Bush narrowly won Colorado in both 2000 and 2004, while Democrats Al Gore in 2000 and John F. Kerry in 2004 eked out wins in Michigan, Minnesota, and Wisconsin.

The surveys were conducted by Quinnipiac University for The Washington Post and The Wall Street Journal as part of a four-month look at swing states. The polls were conducted in each state from June 17 to June 24, and have margins of error ranging from plus or minus 2.5 percentage points to 2.7 points.