From NBC's Mark Murray
A new round of NBC/Mason-Dixon polls shows Obama leading in the battleground state of Wisconsin, McCain ahead in West Virginia, and the two candidates essentially tied in the swing state of Ohio.
In Wisconsin -- a state the Democrats have won in the last two presidential elections -- Obama has a comfortable 12-point lead, 51%-39%.
Meanwhile, in West Virginia -- a state Republicans have won in the last two presidential elections, but the Obama campaign is now targeting -- McCain is up six points, 47%-41%.
And in Ohio -- the state that decided the last election -- McCain has a slim one-point edge over Obama, 46%-45%.
In each state, per the polls, the economy is overwhelmingly voters' top concern. And the candidate that's leading in each one is seen as better handling the issue. In Wisconsin, Obama bests McCain on the economy, 51%-38%; in West Virginia, it's McCain that's ahead, 44%-41%; and in Ohio they're tied, 45%-45%.
The polls were conducted in each battleground state of 625 likely voters from Oct. 16-17, and they have a margin of error of plus-minus 4%.