409. Sivakasi

Indian National Congress held the seat; the winning margin widened from 21.7% to 23.1%.

Boundaries were redrawn between 1971 and 1977 — the comparison is matched by name and is indicative only.

• Won on a lower shareIts own vote share fell 5.1% — it held because the rest of the vote was more divided.
• New challengerNCO (NCO) finished second with 31.5% — it did not contest here in 1971.
• Vote fragmentedThe top two took only 86.0% between them, down from 97.6% — the field split more ways.

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