Going off the air in Maine

Jonathan Martin now reports that Maine is off the table for Republican ads. First Michigan. Earlier today, Wisconsin. Now Maine. In fact, the only blue state where they still are advertising is Pennsylvania. Otherwise, they're placing ads to defend red-to-blue states:

Ohio (Obama +4.3 according to pollster.com)
Virginia (Obama +5.2 according to pollster.com)
Florida (Obama +6.1 according to pollster.com)
North Carolina (Obama +1.5 according to pollster.com)
Indiana (McCain +2.5 according to pollster.com)