A special election (known elsewhere as "by-elections") for Zambales's 2nd congressional district seat in the House of Representatives of the Philippines was held on February 4, 2012.

Jun Omar Ebdane, son of governor Hermogenes Ebdane, won in the special election, beating Cheryl Deloso-Montalla, Diaz's opponent in the 2010 general election, Rica Victoria Diaz-Arambulo, Diaz's daughter, and two other independent candidates.

Antonio Diaz, a nephew of Ramon Magsaysay, was first elected as representative in Zambales' lone district in 1969, serving until 1972 when Congress was dissolved, elected in 1984 in the Regular Batasang Pambansa, won three consecutive terms starting in 1992 for the 2nd District's seat, and another three consecutive terms starting in 2004.

[5] By October, typhoons Pedring and Quiel ravaged the province; with no representative in Congress, the residents had no one to approach for help.

[8] Names floated prior to the filing of certificates of candidacies include Rica Diaz, daughter of Diaz, Cheryl Deloso, daughter of former governor Amor Deloso, Jun Omar Ebdane, son of current governor Hermogenes Ebdane and incumbent provincial administrator, and board members Wilfredo Pangan and Alfred Mendoza.

[10] Jun Omar Ebdane resigned as provincial administrator on January 17 in order to run for the vacant seat.

[13] The commission issued a warning on the Ebdane and Deloso-Montalla campaigns, saying that the posters used were too large than the legally-specified size.

This comes as President Aquino declared February 4 as a special non-working holiday in the province to allow the electorate to vote.

[16] Governor Ebdane said that he will not interfere in the investigation, although a Philippine Star source stated that Madu was a former security officer of the Delosos.