People Power's Wong Yuk-man is the only one among the city's 10 best-known lawmakers to see a rise in popularity over the past three months, according to a University of Hong Kong survey. While Wong's approval rate rose by 4.1 points, all the other nine legislators, irrespective of their political affiliation, suffered rating slumps, according to a poll of 1,015 people held from July 12 to 19 by HKU's Public Opinion Programme. Wong, whose rating is 35.2 out of 100 points, and fellow People Power member Albert Chan Wai-yip were the main advocates of filibustering in the Legislative Council's scrutiny of a by-election bill. They also used other delaying tactics to stall discussion on the government's restructuring plan. The lawmaker with the biggest drop in rating was New People's Party chairwoman Regina Ip Lau Suk-yee, who abstained in the crucial vote to decide whether to fast-track scrutiny of the shake-up plan. The proposal lapsed as it was not passed by a July 17 deadline, when the legislature's term ended. Ip's rating dropped by 6.6 points to 51.9 points compared with a similar survey three months ago. Top of the poll was Civic Party lawmaker Audrey Eu Yuet-mee, scoring 57.2 points, who moved up one place to take the spot from Legco president Tsang Yok-sing. Meanwhile, aspiring lawmakers are showing up to register as candidates for the September 9 Legco poll. Civic Party leader Alan Leong Kah-kit, partnering with pilot Jeremy Tam Man-ho, will campaign in Kowloon East constituency. 'The central government's liaison office has obviously been interfering in the election,' he said. 'It has become a battle between Western District ruling the city and Hong Kong people ruling Hong Kong.' Former League of Social Democrats chairman Andrew To Kwan-hang, who earlier declared his candidacy in the same constituency, plans to issue a letter to the tourism sector's Paul Tse Wai-chun - a fellow candidate whom he said was 'contesting on behalf of the liaison office' - urging an open debate on Tse's political stance. 'Did he receive financial assistance from the liaison office? What is his stance on major political issues, including national education?' asked To, who narrowly missed out on a Legco seat in the 2008 election. Insurance-sector lawmaker Chan Kin-por also signed up yesterday.