Jennifer Duffy with the Cook Political Report tweets the following:

It’s a ratings-palooza kinda day: #ARSen Lincoln from Toss Up to Lean R, #WVSen from Likely D to Lean D, and #OHSen from Toss Up to Lean R

Bad day to be Lee Fisher…

UPDATE: Full release from Cook below:

Senate Lineup: 57 Democrats, 41 Republicans, 2 Independent(s)
Senators with names in parentheses are retiring.
The chart below provides a spectrum that analyzes the vulnerability (the chances of the seat switching parties) of the Senate races up this cycle.
Solid: These races are not considered competitive and are not likely to become closely contested.
Likely: These seats are not considered competitive at this point but have the potential to become engaged.
Lean: These are considered competitive races but one party has an advantage.
Toss Up: These are the most competitive races; either party has a good chance of winning.
DEMOCRATS | 19 HELD SEATS
SOLID D (6)
Inouye (HI)
Mikulski (MD)
Schumer (NY-A)
Gillibrand (NY-B)
Wyden (OR)
Leahy (VT)
LIKELY D (0)
LEAN D (2)
CT (Dodd)
WV (Goodwin)
TOSS UP (7)
Boxer (CA)
Bennet (CO)
IL (Burris)
Reid (NV)
PA (Specter)
Murray (WA)
Feingold (WI)
LEAN R (2)
Lincoln (AR)
IN (Bayh)
LIKELY R (1)
DE (Kaufman)
SOLID R (1)
ND (Dorgan)
REPUBLICANS | 18 HELD SEATS
SOLID D (0)
LIKELY D (0)
LEAN D (0)
TOSS UP (4)
FL (LeMieux)
KY (Bunning)
MO (Bond)
NH (Gregg)
LEAN R (2)
Vitter (LA)
OH (Voinovich)
LIKELY R (1)
Burr (NC)
SOLID R (11)
Shelby (AL)
AK (Murkowski)
McCain (AZ)
Isakson (GA)
Crapo (ID)
Grassley (IA)
KS (Brownback)
Coburn (OK)
DeMint (SC)
Thune (SD)
UT (Bennett)