Rasmussen continues its polling of potential 2010 Senate battlegrounds, with new data in California, Ohio and New York. In each race, the incumbent party holds the advantage.

Ohio Senate
(9/23, 500 LVs, MoE +/- 4.5 percent)
Portman (R) 41 - Fisher (D) 40 - Und 14
Portman (R) 40 - Brunner (D) 38 - Und 18

New York Senate
(9/22, 500 LVs, MoE +/- 4.5 percent)
Gillibrand (D) 44 - Pataki (R) 41 - Und 4

California Senate
(9/23; 500 LVs, MoE 4.5 percent)
Boxer (D) 49 - Fiorina (R) 39 - Und 8
Boxer (D) 46 - DeVore (R) 37 - Und 10