Arkansas was always going to be a tough place for the Democrats to hold their ground, as the state completes a decades-long redshift. Dem incumbent Mark Pryor is somewhat untested, having been first elected in 2002, but facing no GOP opposition in 2008. He’s a moderate on social issues, and was one of only two Democrats to vote against a 2007 Senate resolution to withdraw from Iraq — but Arkansas voters may choose challenger Tom Cotton as a way of expressing their bleak assessment of his vote in favor of ObamaCare. The Washington Post’s Greg Sargent argued this week that ObamaCare isn’t the electoral drag it once was, but Cotton has been running hard against it — and is up by two to four points in most reputable polls. Or as Deb Fillman noted last week:

Take ObamaCare for example; there are no fewer than 13 Democratic candidates currently running full-tilt away from their votes to pass it. Candidates like Mary Landrieu (D-LA), Mark Pryor (D-AR), and Kay Hagan (D-NC), to name a few, are doing everything they possibly can to apply all three of the above tactics to distance themselves from the President’s “Lie of the Year,” a lie they all parroted dutifully, not just once, but multiple times.

I really don’t need to mention Montana, but I do really want to. Republican Steve Daines is hardly the most inspiring candidate, yet he’s up by an average of 14 points over sitting Democrat John Walsh — and that’s before Walsh dropped out of the race over plagiarism charges from a 2007 paper he wrote while attending the Army War College. Montana Democrats have since settled on state House member Amanda Curtis, who reminds me of a woman I dated for about three weeks in 1997, only more smug and less sane. This YouTube collection of her greatest video podcasting hits is priceless.

The folks at DailyKos, perhaps not exactly the keenest observers of Montana politics, think she’s a winner — which means she’ll be lucky to snare Walsh’s meager 38% on election day. Honestly, races like this one are why I love American politics and always will.

Keep your eye on Colorado and Oregon, too. You can smell the desperation of the Mark Udall campaign, even though only Quinnipiac shows GOP challenger Cory Gardner with even a modest lead. My friend (and numbers guy) Tom Dougherty will have new numbers crunched on Friday, but as of last month he still had Oregon in play for newcomer Monica Wehby.

With all this anti-incumbent fever, you might expect the GOP to lose a few seats on the House side of the Capitol Building. Only 17 races are considered truly competitive this year, and out of those a grand total of four are currently in GOP hands. All things being equal, the Republicans might actually net a half dozen seats. That’s remarkable for one reason: The Democrats have a natural floor of about 175 House seats — races they couldn’t lose if they nominated flesh-eating zombies. And the Republicans are near their natural ceiling of about 245 seats — races they couldn’t win if they nominated God, Himself. So if voters were looking to reject incumbents, the GOP would have by far the most to lose.

What we might be witnessing then isn’t the rejection of politics-as-usual, but the rejection of politics-by-Democrats.

Also read:

Naive Mitt Romney Still Doesn’t Get It: Obama Does Not Make Policy ‘Mistakes’