...that's definitely good news for Kerry. My impression formed over many years is that M-D's polls lean Republican. In the same batch with the Ohio poll, M-D has Bush up 3 in New Hampshire and up 10 in Nevada, both of which are more favorable to Bush than other polls.
Mason-Dixon numbers
http://msnbc.msn.com/id/6256939/
Compendium of state polls
http://race2004.net/