Sen. Jim Inhofe (R-OK), while stumping for Colorado U.S. Senate hopeful Ken Buck last Thursday, issued a list of guaranteed Senate wins:
We’ll take over the following seats where there are Democratic incumbents: Arkansas, Colorado, Florida, Illinois, Indiana, Pennsylvania, Washington state, Wisconsin, West Virginia — where I’ll be Monday — North Dakota, and I think California.
In case you're keeping track (and Think Progress is) that would give the GOP the 10 seats necessary to regain control of the U.S. Senate: