The Bakersfield Republican was pulled over after his vehicle was observed weaving near L and 13th streets at about 2 a.m., according to CHP officials.
Click here for more from Bee colleague Bill Lindelof.
UPDATE 5 p.m.: Ashburn released the following statement on his arrest: "I am deeply sorry for my actions and offer no excuse for my poor judgment. I accept complete responsibility for my conduct and am prepared to accept the consequences for what I did. I am also truly sorry for the impact this incident will have on those who support and trust me - my family, my constituents, my friends, and my colleagues in the Senate."