The two neophytes, Bongbong Marcos and TG Guingona, had their fathers previously serve in the Senate.

It is expected that Manuel Villar of the Nacionalistas and Francis Pangilinan from the Liberals be the top contenders to be Senate President; incumbent Juan Ponce Enrile (PMP) originally said he would not seek the office, but with the inability of either of the frontrunners to garner the required thirteen votes, he has presented himself as a compromise candidate to avoid deadlock.

[2] Philippine Senate elections are via pluraity block voting, with the entire country as an at-large "district".

Celebrities also endorsed candidates, notably Kris Aquino for Tito Sotto and Sharon Cuneta for Neric Acosta.

As a callback to the successful "VOT FOR D CHAMMP" campaign slogan of the People Power Coalition during the 2001 election, the Liberals used the "SLAMAT LORRRD" acronym to easily convey their senatorial line-up.

On April 18, ABS-CBN held the Harapan (Face-Off) senatorial debates at La Consolacion College – Manila.

The other winning incumbents are Miriam Defensor Santiago, Lito Lapid, and Senate president Juan Ponce Enrile.

Key: With the election of Benigno Aquino III as president, there were only 23 seats in the Senate's chamber for the 15th Congress of the Philippines.

There were calls to let the 13th placed candidate, Risa Hontiveros-Baraquel, to be proclaimed in lieu of Aquino leaving the Senate but neither her campaign nor the Liberal Party petitioned the commission on the matter.

With the lineup for the 15th Congress becoming apparent, senator-elect Miriam Defensor-Santiago (PRP) commented that her ally Manuel Villar has the numbers to retake the Senate Presidency.

[25] Perceived voting blocs in the Senate:[24] On July 23, previous Senate President Enrile announced that he was approached by Drilon, Recto (both Liberals) and Escudero (independent) on July 20 informing him that they will support him once he agrees to be included in the race.

Sotto (NPC) remarked that retaining Enrile emerged as a viable compromise to prevent an impasse on the opening of Congress.

[28] Recognizing that he can't secure the required 13 votes to win the Senate Presidency, Pangilinan has withdrawn his bid on July 25.