[4] In June 2005, Lin was selected one of four caucus whips for the TSU, serving alongside Ho Min-hao, David Huang, and George Liu.

[5] Party chairman Huang Chu-wen stepped down from the position in December 2004 and supported Kuo's candidacy for the leadership,[6] who registered for the election later that month.

[7] Lee Teng-hui backed Shu Chin-chiang, who eventually was appointed party chairman in January 2005, Lin expressed dissatisfaction with the procedure.

[10] While reviewing amendments to the Domestic Violence Prevention Law in 2006, Kuo opined that LGBT rights had been neglected up to that point, and cited the impact of the 2005 film Brokeback Mountain to improve protections.

[11] Alongside Hsiao Bi-khim, Kuo urged adherence to the Administrative Procedure Law, which stated that foreigners who were denied residency or deported from Taiwan should be provided a document explaining the reasoning for the decision.

[12] Later that year, Kuo commented on the judicial career of Cheng Chung-mo [zh] and urged respect for an independent Taiwanese judiciary.

[17] In June 2007, Kuo stated that the Taiwan Solidarity Union caucus would not support a no-confidence motion proposed by Chen Chin-te.

[22] In August 2007, the French government detained and searched two Taiwanese citizens because they provided two differently designed Taiwan passports as identification.