175. Nagapattinam

Communist Party of India (Marxist) held the seat; the winning margin widened from 2.8% to 5.5%.

• Won on a lower shareIts own vote share fell 3.1% — it held because the rest of the vote was more divided.
• New challengerAll India Anna Dravida Munnetra Kazhagam (AIADMK) finished second with 42.7% — it did not contest here in 1980.
• Vote fragmentedThe top two took only 91.0% 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.