Taiwan's ruling DPP is putting its full weight behind Su Chiao-hui in the New Taipei mayor race, a sign the party sees the city as winnable but is treating it as a must-win fight.

• Su Chiao-hui's campaign headquarters opens in Banqiao with President Lai Ching-te, former president Tsai Ing-wen, and Kaohsiung mayor Chen Chi-mai all showing up.
• Vice President Hsiao Bi-khim also recorded a message of support, so nearly the entire DPP leadership is backing her.
• Her pitch is generational: a younger mayor who can get things done for New Taipei.
• Her rival Lee Si-chuan appeared the same morning in the same district alongside Taipei mayor Chiang Wan-an, matching the show of force.
• Opposition polling has shown Su slightly ahead in Banqiao, the biggest voting bloc in the city.

Outlook: Expect both camps to keep stacking big-name endorsements as the New Taipei race turns into a proxy fight between the DPP and the KMT.