Both the Romney campaign and GOP super PACs like Karl Rove’s Crossroads GPS appear to be conceding both Michigan and Pennsylvania to President Obama. They’re not running any ads there.
This saves the Obama campaign some money. Often the other side spends money in a state they expect to lose just to force you to spend money there and have less to spend in the real battlegrounds.
Although Michigan is Mitt’s home state, I never saw it as a swing state, given his opposition to the auto bailout, but I did see Pennsylvania.
If they change their minds and begin advertising in one or both states, it means they see the race tightening. This would be an interesting development.