Democratic presidential candidate Barack Obama has a lead of anywhere from 10 to 29 points in every Midwestern state, according to the latest Big Ten Battleground States poll.

In Iowa, Obama leads Republican John McCain 52 to 39. The last Big Ten poll had Iowa as virtually tied at 42.7 percent for Obama and 42 percent for McCain.

“In September, we saw virtually the entire Big Ten as a battleground,” said Charles Franklin, co-developer of Pollster.com and a political science professor at the University of Wisconsin-Madison. “Now Obama is clearly winning the Big Ten battleground. The dominance of the economy as a top issue for voters is the overwhelming story.”

Head-to-head results for individual states

Illinois Obama 61% McCain 32%
Indiana Obama 51% McCain 41%
Iowa Obama 52% McCain 39%
Michigan Obama 58% McCain 36%
Minnesota Obama 57% McCain 38%
Ohio Obama 53% McCain 41%
Pennsylvania Obama 52% McCain 41%
Wisconsin Obama 53% McCain 40%

The surveys consisted of phone interviews of between 562 and 586 randomly selected registered voters and those likely to register to vote before the election in each of the states and were conducted by phone with live interviewers from Oct. 19-22. The polls each have a margin of error of 4.2 percentage points.