DEMOCRAT INCUMBENT Arkansas (Beebe): Safe D Colorado (Ritter): Leans R Illinois (Quinn): Leans R *** Iowa (Culver): Leans R Maryland (O'Malley): Likely D Massachusetts (Patrick): Leans R New York (Patterson): Tossup *** Ohio (Strickland): Tossup DEMOCRAT-HELD OPEN SEAT Kansas: Likely R Maine: Leans D* Michigan: Leans R New Mexico: Likely D Oklahoma: Likely R Oregon: Leans D* Pennsylvania: Tossup* Tennessee: Leans R Wisconsin: Tossup* Wyoming: leans D** REPUBLICAN-HELD OPEN SEAT Alabama: Safe R California: Tossup Florida: Likely R Hawaii: Likely D Rhode Island: Leans D* South Carolina: Likely R South Dakota: Likely R REPUBLICAN INCUMBENT Alaska (Parnell): Likely R Arizona...