***TUESDAY UPDATE*** The RNC is softening the ground for Wednesday's TV ad buy with two new radio spots obtained by the Huffington Post.
One week out from election day, the Republican National Committee is going up with advertising in Montana, a Democratic source tells the Huffington Post. It is yet another instance of Republicans having to defend their own turf -- President Bush won the state by over 20 points in 2004.
(Update: The Fix's Chris Cillizza confirms the news with Republican sources, says the ads will begin on Wednesday.)
The Pollster.com average of surveys shows that John McCain took a firm lead in Montana after the Republican convention. One month later, however, the GOP ticket seemingly nosedived. It's now apparently enough of a concern for the national party to step in and help.
The most recent Montana State University poll showed Obama with a 44-40 lead over McCain, with a 5 percent margin of error.