Delaware may not be doable for the Republicans, but take a look at Wisconsin: “After a decisive win in Tuesday’s Republican Primary, businessman Ron Johnson now holds a seven-point lead over incumbent Democrat Russ Feingold in Wisconsin’s U.S. Senate race.” This may be part of a post-primary-vote bump, but still.
The Republicans need 10 seats to take the Senate. (I will put aside the possibility of a Joe Lieberman party switch.) Here are nine: Arkansas, Illinois, Indiana, North Dakota, Wisconsin, California, Nevada, Colorado, and Pennsylvania. Add either Washington or West Virginia and the GOP gets to 10. Hard? Yes. Impossible? Hardly.