Frank Hsieh
Su, along with politicians Annette Lu, Frank Hsieh and Yu Shyi-kun, are collectively known as the "Big Four of the Democratic Progressive Party". Su is nicknamed the "Lightbulb" () by the Taiwanese media and DPP voters, a nickname he earned in the 1980s for his charismatic approach to campaigning during election season, in addition to being an affectionate reference to the balding Su.