[3] On January 10, 2008, Oller again ran for Congress, this time in California's 4th congressional district, for a seat being vacated by retiring Congressman John Doolittle.

[3] On March 4, 2008, Oller dropped out of the race when California State Senator Tom McClintock (R-Thousand Oaks) announced that he was running for Doolittle's seat.

"[4][5] Oller ran for the newly former 5th Assembly District in 2012, facing Madera County Supervisor Frank Bigelow in the November general election.

[6] Oller fought against the expansion of Smog Check II and authored legislation to abolish the program.

He convened an oversight hearing into the spread of noxious weeds across California and carried legislation to promote the reactivation of the Auburn Dam.