The former Pomona City Council member now represents the 52nd Assembly District, including the southern California communities of Pomona, Montclair, Ontario, and Chino.
He is taking the seat previously held by Democrat Norma Torres, who now serves in the state Senate.
As the legislative musical chairs continue with special elections, two vacancies still remain in the Assembly. Democrats in the lower house are one seat away from reclaiming a two-thirds supermajority.
PHOTO: Assemblyman Freddie Rodriguez, D-Pomona, greets others at the reception following his swearing in at the California state Capitol on Friday, Oct. 11, 2013. The Sacramento Bee/Laurel Rosenhall