2004 Philippine Senate election

The Koalisyon ng Katapatan at Karanasan sa Kinabukasan (Coalition of Honesty and Experience for the Future) was the remnant of the People Power Coalition that was formed following the ascendancy of President Gloria Macapagal-Arroyo to power. Arroyo was seeking a full term under the K4 coalition with Senator Noli de Castro, an independent, popular politician, as her running mate. The leading party in this coalition is the ruling Lakas—Christian Muslim Democrats, of which Arroyo was a member. Other parties under this coalition are Liberal Party, Nacionalista Party, Nationalist People's Coalition and People's Reform Party.

The Koalisyon ng Nagkakaisang Pilipino (Coalition of United Filipinos) was the coalition of the "united opposition". Its presidential and vice-presidential candidates were Fernando Poe Jr. and Senator Loren Legarda. The leading parties of this coalition were Laban ng Demokratikong Pilipino—Angara wing, PDP–Laban, and Pwersa ng Masang Pilipino. The LDP split had been caused by stubbornness between presidentiables Poe and Senator Panfilo Lacson, especially with Poe's support from former President Joseph Estrada and former First Lady Imelda Marcos. The other major party under this coalition was Estrada's Partido ng Masang Pilipino.

The third major coalition running in this election is the Alyansa ng Pag-asa (Alliance of Hope), This coalition fielded Raul Roco for president and Herminio Aquino for vice-president. The three major parties supporting this coalition were Roco's Aksyon Demokratiko, former National Defense Secretary Renato de Villa's Partido para sa Demokratikong Reporma, and former Cebu Governor Lito Osmeña's Probinsya Muna Development Initiative. These three parties bolted from the People Power Coalition.

Bangon Pilipinas (Rise Up, Philippines) is the political party of Bro. Eduardo Villanueva. It consisted mostly of volunteers, a majority of whom came from Villanueva's Jesus Is Lord church. Villanueva resigned from the church before submitting his candidacy in order to prevent questions on the separation of church and state.

This coalition led by Makati Representative Butz Aquino was composed of Panfilo Lacson's supporters from LDP party.

This was Eddie Gil's organization. Gil was deemed a nuisance candidate and was disqualified from the presidential race. However, the party qualified for other positions.

1. Rene Cayetano (Lakas), died on June 25, 2003
2. Blas Ople (LDP), appointed Secretary of Foreign Affairs on July 16, 2002, died on December 14, 2003

1. Noli de Castro (Independent), ran for vice president and won
2. Loren Legarda (KNP), ran for vice president and lost

The official results of the election were released in staggered dates with most winners in local elective positions declared within two weeks from the May 10 election date. The winners in the Senatorial and Party-list Representative elections were declared on May 24, with the exception of the 12th senator which was announced on June 3. The results of the Presidential and Vice-Presidential races were finalized by the Congress on June 20, more than a month after the elections. Out of the 43,536,028 registered voters, about 35.4 million ballots were cast giving a voter turn-out of 81.4%.

• Philippine Presidency Project
• Philippine Commission on Elections
• National Movement for Free Elections (NAMFREL)

• Eleksyon 2004 (Media website)
• 4 exit polls have 3 different winners - Philippine Daily Inquirer
• Proberz exit polls: FPJ winner
• Congress approves canvassing rules - Philippine Daily Inquirer
• SWS admits it made errors in exit poll - Philippine Daily Inquirer

• On Election Polls: Part IV WHO DID BETTER - SWS OR PULSE ASIA? - Dr. Romula A. Virola
• Dec. 30, 2002 Arroyo speech declaring her intention not to run
• P.E.T. Case No. 003, Legarda vs. De Castro