After his three terms as representative, he ran for senator in the May 2010 elections; then-Representative Liza Maza of the women's partylist group GABRIELA and Ocampo were fielded by the Makabayan coalition and were included as guest senatorial candidates of the Nacionalista Party, a mainstream Philippine political party whose presidential standard bearer, Senator Manny Villar, they supported.

In 1985, while on pass to vote at the National Press Club annual elections, he escaped from the soldiers guarding him and rejoined the underground revolutionary movement.

When the talks collapsed due to the killing of 18 farmers at a rally near the Malacañan Palace on January 22, 1987, Ocampo returned to the underground.

On November 28, 2018, Ocampo, Alliance of Concerned Teachers Rep. France Castro and over 70 others were arrested on allegations of kidnapping and human trafficking charges over the transport of Lumad minors from the town of Talaingod, Davao Del Norte.

[8] On December 4, 2024, Ocampo and 74 others with the endorsement of Rep. Castro filed the second impeachment complaint against Vice President Sara Duterte, citing betrayal of public trust for her office's alleged misuse of confidential funds.