Taiwan's two opposition parties, the KMT and the TPP, have fallen out and are now attacking each other openly — bad news for both, and good news for the ruling DPP.

• The "blue-white" opposition alliance has broken down into a public fight.
• Analysts expect the split to reshape the race, since the two parties were counting on joint candidates to beat the DPP.
• Splitting the opposition vote in three-way races is the main way the DPP wins seats it would otherwise lose.
• The feud also weakens the opposition's grip in the legislature, where blue-white cooperation has been blocking the government.

Outlook: Expect pressure on both sides to patch things up before candidate registration, or the DPP picks up seats it did not expect to win.