Dem likely hold: CO
Dem likely pickup: IL
Tossup: FL, NH, NV, PA, WI
Rep likely pickup: --
Rep likely hold: AZ, IN, NC, OH
I doubt the map exceeds these states
The key to Dems winning the tossups is getting top-tier candidates in those states. The problem is that in NV, PA, and WI there is a bit of a shortage of top-tier candidates.
I believe that the GOP is vulnerable in AZ, IN, OH, and IA if top-tier candidates could be persuaded to run. I think Grassley is vulnerable due to age. On the other hand, I view Ayotte as a pretty safe pick for re-election, even against Hassan.