Dr. Tsai joined the Democratic Progressive Party (DPP) in 2004 and became a DPP legislator at-large (2005-2006). She was then appointed to serve as vice premier (2006-2007). After the DPP returned to the opposition, Dr. Tsai was elected DPP chairperson for two successive terms (2008-2010 and 2010-2012), the first woman to chair a major political party in Taiwan. She returned as DPP chairperson in 2014, a position she held until 2018. Dr. Tsai represented the DPP in Taiwan's 13th-term presidential election in 2012, becoming Taiwan's first female presidential candidate. She ran again as the DPP candidate in 2016, and was elected as the nation's 14th-term president. The first female head of state in Taiwan's history, Dr. Tsai is also the first female head of state in Asia who was not born into a political family. Dr. Tsai represented the DPP in the nation’s 15th-term presidential election in 2020 and was successfully re-elected with over 8.17 million votes, the highest total in history. Dr. Tsai was officially sworn in as the 15th-term President in May and concurrently served as DPP chairperson until November 2022.