Average Vote in Elections
I have compiled the average vote for the two cities in lived in in 2010 and 2008, to show the trend in change. I don't know if they are representative of the national average, but have striking similarities.
Spokane City 2008 : Dem 54% Rep 45% Ind 1&
Spokane City 2010 : Dem 49% Rep 51%
Helena 2008 : Dem 66% Rep 32% Ind 2%
Helena 2010 : Dem 60% Rep 39% Ind 1%
Spokane suburban 2008 : Dem 39% Rep 61%
Spokane suburban 2010 : Dem 29% Rep 71%
Lewis & Clark suburban/rural 2008 : Dem 51% Rep 47% Ind 2%
Lewis & Clark suburban/rural 2010 : Dem 33% Rep 65% Ind 2%
Both the cities have a 6% swing to the Republicans, while the areas outside the cities went heavily Republican in swings. Both counties large swings were fueled by a huge increase in the Republican state legislative vote. In rural/suburban LC in 2008, the Democrats actually had a 400 vote margin while in 2010, every Republican legislative candidate carried the district outside the city.
So you see, one of the Democrats problems is they can carry their natural base inside cities, but have to appeal to suburban/rural voters to win elections.