58. Panruti

Dravida Munnetra Kazhagam held the seat; the winning margin narrowed from 21.6% to 11.1%.

• Won on a lower shareIts own vote share fell 8.8% — it held because the rest of the vote was more divided.
• New challengerNCO (NCO) finished second with 41.0% — it did not contest here in 1967.
• Vote fragmentedThe top two took only 93.0% between them, down from 100.0% — the field split more ways.

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