Taiwan's year-end local elections are now 100 days out, and the race for New Taipei mayor is turning into a marquee fight between the DPP and the KMT.

• Former president Tsai Ing-wen is chairing Su Chiao-hui's campaign and says she would be New Taipei's first woman mayor.
• Tsai and Su prayed at a Banqiao temple with crowds of supporters, and Tsai promised to show up whenever Su needs her.
• Su's campaign headquarters opens September 5 in Banqiao, with President Lai Ching-te and Tsai both attending.
• KMT candidate Li Si-chuan is running on infrastructure: a new metro line along the Dahan River, burying the Shulin railway underground, and river cleanup in Sanxia.
• Li argues the rail project is only a question of political will, pointing to finished underground rail work in Taipei's Songshan and Nangang.

Outlook: Expect both camps to escalate through September as campaign offices open and the race narrows to identity and development promises.