458. Dehra Dun

Indian National Congress held the seat; the winning margin narrowed from 33.3% to 31.1%.

• Won on a lower shareIts own vote share fell 7.2% — it held because the rest of the vote was more divided.
• New challengerJS (JS) finished second with 19.8% — it did not contest here in 1957.
• Vote fragmentedThe top two took only 70.6% between them, down from 82.8% — the field split more ways.

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