Not on the list.
I think they left Mandel off the list because Ohio is not as close a race as any of these listed here (except Maine). The Dem is winning it by more than 5 points.
http://www.realclearpolitics.com/epolls/2012/senate/oh/ohio_senate_mandel_vs_brown-2100.html
Ohio (D hold) Real Clear Politics Average: Brown 47.8%, Mandel 42.2%
Yep, forgot OH. Rs will pick that one up also in addition to WI and VA.