Sin Chung-kai joins Martin Lee and Yeung Sum in stepping down Democratic Party vice-chairman Sin Chung-kai has decided not to stand in the Legislative Council election in September. Mr Sin announced that he would support second-tier hopeful Kam Nai-wai to lead the party ticket on Hong Kong Island after month-long internal opposition to his plan to switch from the information technology seat to Kowloon West and, later, Hong Kong Island. Mr Sin is the third veteran Democrat to step down after Martin Lee Chu-ming and Yeung Sum, raising concerns over the party's future. The decision also called into question whether Mr Kam, a lesser-known district councillor, could defeat heavyweights from rival and allied camps to preserve at least a single seat for the party on Hong Kong Island. It currently has two. Analysts say the Democratic Party only has sufficient votes to win one seat on the Island as leading figures such as former chief secretary Anson Chan Fang On-sang and the Civic Party's Audrey Eu Yuet-mee and Tanya Chan Shuk-chong would dilute support. The rival camp is also facing tough competition, with former security chief Regina Ip Lau Suk-yee vying with Democratic Alliance for the Betterment and Progress of Hong Kong lawmakers Tsang Yok-sing and Choy So-yuk for the six seats up for grabs. In a hastily arranged press conference, Mr Sin said he decided to pull out after considering all factors. He declined to give details, but stressed his withdrawal would be the best arrangement for the party. 'The process leading to my decision is no longer important. What matters now is the party and I support Mr Kam in full,' he said, standing hand in hand with Mr Kam and Dr Yeung in a show of solidarity. Mr Kam said he was fully confident of winning a seat for the party. Dr Yeung said he would rank second on Mr Kam's ticket but said the chance of winning would be slim. Mr Sin, 48, seen as a frontrunner for the party chairman's post, would not say if the succession plan had been affected by his decision not to run in the election. Asked if he would consider standing in another constituency in September, he said: 'The chance is not high. But never say never.' Political analyst Ivan Choy Chi-keung said whether Mr Kam could win would hinge on whether Mrs Chan decided to stand. 'With heavyweights stepping down one by one, there may be a tendency that the party may be downgraded to the level of the Association for Democracy and People's Livelihood in the long run,' he said. Fellow analyst Ma Ngok said the withdrawal of leading figures would make the election a real test for the party's support. But he believed the Democrats would not have difficulty in winning one seat.