Finding — Stalin's loss in Kolathur, round by round
Sitting CM lost his own seat to a TVK newcomer. The round-by-round detail shows Stalin never led at any point during counting. By round 1, V.S. Babu was already ahead.
The final result
| Position | Candidate | Party | Total votes | % |
|---|---|---|---|---|
| 1st | V. S. BABU | TVK | 82,997 | 45.1% |
| 2nd | M. K. STALIN | DMK | 74,202 | 40.3% |
| 3rd | P. SANTHANA KRISHNAN | AIADMK | 18,430 | 10.0% |
| 4th | NOTA | — | 892 | 0.5% |
| 36 candidates total |
Final margin: 8,795 votes (4.8 percentage points). Stalin contested 22 of 234 winning candidates; he was one of the 18 losers in races decided by 5,000 to 10,000 votes — not the closest race in TN, but politically the most consequential.
Round-by-round: did Stalin ever lead?
The Kolathur count ran 22 rounds. Babu led every single round. Stalin never opened a lead.
| Round | Babu | Stalin | Babu's lead |
|---|---|---|---|
| 1 | 1,200 | 0 | +1,200 |
| 2 | 2,226 | (rising) | growing |
| 4 | 16,692 | 14,141 | +2,551 |
| 8 | 33,609 | 27,105 | +6,504 |
| 12 | 49,099 | 41,051 | +8,048 |
| 16 | 64,810 | 57,219 | +7,591 |
| 20 | 80,548 | 71,385 | +9,163 |
| 22 (final) | 82,614 | 73,220 | +9,394 (EVM only) |
| + Postal | +383 | +982 | postal helped Stalin |
| Grand total | 82,997 | 74,202 | +8,795 |
A counting-day non-story
There was no surge, no comeback, no dramatic late round. Babu was ahead from the first round and the margin grew almost monotonically. The drama was political (sitting CM losing his own seat), not arithmetic.
The postal-vote effect
Look at the final numbers carefully:
| EVM | Postal | Total | |
|---|---|---|---|
| Babu (TVK) | 82,614 | 383 | 82,997 |
| Stalin (DMK) | 73,220 | 982 | 74,202 |
| Postal advantage | +599 for Stalin |
Stalin got 2.6× more postal votes than Babu (982 vs 383). On postal votes alone, Stalin would have won Kolathur. The institutional/elderly/govt-employee/armed-forces postal cohort preferred Stalin by a substantial margin — but those 599 extra postal votes barely dented a 9,394-vote EVM gap.
This matches the statewide pattern (postal vs EVM finding): Stalin's voter base skewed older + institutional + postal-eligible, while Babu's was the under-50, in-person, EVM-casting cohort.
Booth-level pattern (from form20 OCR, 2 booths only)
We only OCR'd 2 of Kolathur's 238 booths (smoke test for Path B). Even at that tiny sample:
| Booth | Stalin | Babu | Margin |
|---|---|---|---|
| 1 (Selvi Nagar) | 190 | 471 | Babu +281 |
| 2 (same school, adjacent area) | 207 | 255 | Babu +48 |
In booths 1 and 2, Stalin's combined share was ~38% — close to his AC-wide average of 40.3%. Nothing unusual in those specific booths.
The booth-level full picture (238 booths) would tell us:
- Which booths went 65/35 Stalin vs 35/65 Babu — i.e., where Stalin's bastions were within his own AC.
- Whether DMK retained any cluster of booths or lost across the board.
- If we had voter rolls + name-inference, where the religion/caste-composition crossover happened.
We have the PDFs in S3; we just haven't OCR'd them. That's Path B, ~$0.20 + 80 min on deemwar for full Kolathur, or ~$20 if we cloud-OCR via Google Vision.
What this AC tells us about TN 2026
- CM losing his own seat happened in TN before — but rarely. M. Karunanidhi held his seats; J. Jayalalithaa won her seats. Stalin being defeated in Kolathur is genuinely unusual at the level of incumbency in Indian politics.
- The margin (8,795 votes / 4.8 pp) is well above noise. This isn't a "could go either way" race — Babu won fair and decisively.
- Stalin's 40% in his own seat is itself a story. In 2021 he was at ~70%+ in Kolathur. Losing 30 percentage points in your own constituency is a personal repudiation.
The "Kolathur is symbolic" interpretation
Among all 234 ACs where DMK lost, Kolathur is the symbolic centrepiece. The media framed it as the moment the DMK era ended. Our data supports that framing in one specific way: Stalin did worse in Kolathur than DMK did on average (his swing of −30 pp was bigger than DMK's statewide median swing of −15 pp). His personal brand didn't insulate him — possibly the opposite, since his loss made it the headline seat for "the DMK era is over" coverage.
Cross-check
- Per-AC totals from
s3://tnelection2026/results/curated/year=2026/ac=13/candidate_totals.parquet - Round-wise from
s3://tnelection2026/results/curated/year=2026/ac=13/round_votes.parquet - Booth-level (2 of 238) from
s3://tnelection2026/form20/curated/year=2026/ac=13/votes.parquet - Computation in
pipelines/deep_dive.py(Kolathur block at the end)