Lau Weng San

In the 2008 Selangor state election, Lau made his electoral debut after being nominated by PR to contest for the Kampung Tunku state seat. Lau won the seat and was elected to the Selangor State Legislative Assembly as the Kampung Tunku MLA for the first term after defeating Sheah Kok Fah of Barisan Nasional (BN) by a majority of 7,977 votes.[3]

In the 2013 Selangor state election, Lau was renominated by PR to defend the Kampung Tunku seat. Lau defended the seat and was reelected to the Selangor State Legislative Assembly as the Kampung Tunku MLA for the second term after defeating Kelvin Chong Seng Foo of BN by a majority of 13,685 votes.

In the 2018 Selangor state election, Lau was renominated by PH to contest for the Banting seat instead of defending the Kampung Tunku seat. Lau won the seat and was reelected to the Selangor State Legislative Assembly as the Banting MLA for the first term after defeating Ng Siok Hwa of BN and Philip Tan Choon Swee of Parti Rakyat Malaysia (PRM) by a majority of 17,299 votes.

In the 2023 Selangor state election, Lau was not renominated by PH to defend the Banting seat and contest for other seats.[4]

He questioned the dissatisfaction of the Selangor BN MLAs of the rejection of the Speaker of the Selangor State Legislative Assembly Hannah Yeoh Tseow Suan in the proposed amendment to empower the Syariah Court.[5] He also disputed the appointment of the Director of the Selangor Islamic Religious Department (JAIS) Mohd Khusrin Munawi as the new Selangor State Secretary. In addition, he created a signature drive and aimed for 100,000 signatures to seek an auxiliary police unit in Petaling Jaya during his term as the Selangor MLA.[6]

On 24 July 2023, Minister of Transport and Secretary-General of DAP Anthony Loke Siew Fook revealed that the party would nominate Lau for the position of the Speaker of the Selangor State Legislative Assembly in exchange for the party not to defend the Dusun Tua state seat and allowing it to be contested by the BN and United Malays National Organisation (UMNO) instead in the spirit of political and electoral cooperation between PH and BN should they win the 2023 Selangor state election and form the next state administration for the term of the 15th Selangor State Legislative Assembly.[7] On 19 September 2023, Lau was nominated by Menteri Besar Amirudin Shari and seconded by EXCO Member as well as Banting MLA Papparaidu Veraman as the 12th Speaker of the Selangor State Legislative Assembly. He was elected and sworn into office after winning the election with 34 votes, defeating the candidate nominated and seconded by PN who lost the election with 22 votes. After his election as the Speaker, he also swore Bukit Antarabangsa MLA Mohd Kamri Kamaruddin as the Deputy Speaker.