Taiwan's opposition pact between the KMT and the Taiwan People's Party has broken down in Hsinchu County, and some TPP supporters are now backing the ruling DPP candidate instead.

• The TPP says KMT candidate Hsu Hsin-ying broke promises, wrecking two years of trust between the two parties.
• The TPP is now threatening to expel any member who publicly backs another party's Hsinchu County candidate.
• Angry TPP supporters are switching to DPP candidate Cheng Chao-fang, and the DPP is happily encouraging them.
• DPP caucus whip Chuang Jui-hsiung called the switch smart, saying voters should not be forced to pick a bad option just to keep the alliance alive.
• What started as an opposition alliance turned into infighting and is now an open fight between the two parties.

Outlook: The split gives the DPP a real opening in Hsinchu County, and more opposition cooperation deals could unravel as local elections approach.