56. Vanur

All India Anna Dravida Munnetra Kazhagam held the seat; the winning margin narrowed from 17.4% to 2.9%.

• Won on a lower shareIts own vote share fell 13.1% — it held because the rest of the vote was more divided.
• New challengerPattali Makkal Katchi (PMK) finished second with 39.7% — it did not contest here in 2001.
• Vote fragmentedThe top two took only 82.3% between them, down from 93.9% — the field split more ways.

Written from the constituency figures by a fixed set of rules — no language model.