Tamil Nadu Elections 2026: A Look Back At 2021 Opinion Polls Vs Exit Polls Vs Actual Results

The 2021 Tamil Nadu Assembly election was one of the most closely watched state contests in recent years, not just because it marked a major transition in the state's politics, but also because it was the first election in decades without the towering presence of M Karunanidhi and J Jayalalithaa. In the run-up to polling, opinion surveys had already pointed towards a DMK-led alliance advantage. After voting ended, exit polls reinforced that view and in some cases predicted an even larger mandate. When the votes were counted, the final result confirmed a DMK return to power after 10 years, though the actual scale of victory was smaller than the most bullish forecasts.

Opinion Polls Had Already Signalled A DMK-Led Comeback

One of the most cited pre-poll projections was the ABP News-CVoter opinion poll released in March 2021, which suggested that the DMK-led alliance was comfortably ahead of the ruling AIADMK-led alliance.

ABP-CVoter Opinion Poll (March 2021):

• DMK-led alliance: 161-169 seats
• AIADMK-led alliance: 53-61 seats
• MNM: 2-6 seats
• AMMK: 1-5 seats
• Others: 3-7 seats
• DMK-led alliance vote share: around 43%+
• AIADMK-led alliance vote share: around 30.6%
• MNM vote share: 7.0%
• AMMK vote share: 6.4%
• Others vote share: 12.3%

The same survey also suggested that M K Stalin held a clear edge over Edappadi K Palaniswami in the chief minister preference question, reinforcing the perception that the opposition had momentum heading into polling.

Exit Polls Predicted A Stronger DMK Wave After Voting Ended

After voting concluded, almost all major exit polls pointed to the same broad conclusion: the DMK-led alliance was heading for victory. However, several exit polls projected a larger wave than what the opinion polls had indicated earlier.

India Today-Axis My India Exit Poll

• DMK-led alliance: 175-195 seats
• AIADMK-led alliance: 38-54 seats
• DMK-led alliance vote share: 48%
• AIADMK-led alliance vote share: 35%
• AMMK: 3%
• MNM: 4%
• Congress: 16-18 seats
• BJP: 2-4 seats
• PMK: 2-4 seats
• Left parties: 9-11 seats
• VCK: 3-5 seats
• IUML: 0-1 seat

ABP-CVoter Exit Poll

• DMK-led alliance: 160-172 seats
• AIADMK-led alliance: 58-70 seats
• MNM: 0-2 seats
• AMMK: 0-2 seats
• Others: 0-3 seats
• DMK-led alliance vote share: 46.7%
• AIADMK-led alliance vote share: 35.0%
• MNM vote share: 4.1%
• AMMK vote share: 3.8%
• Others vote share: 14.5%

Other Exit Poll Estimates

• Today's Chanakya: DMK combine 164-186, AIADMK alliance 46-68
• Republic TV-CNX / CNX summaries: broadly around DMK 160-179, AIADMK 58-69

The Final Result Confirmed The Winner, But Not The Full Scale Of The Exit Poll Hype

When results were declared on May 2, 2021, the central prediction of both opinion polls and exit polls proved correct: the DMK-led alliance returned to power. But the actual result was not as overwhelming as some of the biggest exit poll projections had suggested. The final seat tally was as follows:

Final Party-Wise Result

• DMK: 133 seats
• AIADMK: 66 seats
• Congress: 18 seats
• PMK: 5 seats
• BJP: 4 seats
• VCK: 4 seats
• CPI: 2 seats
• CPI(M): 2 seats

Final Broad Alliance Tally

• DMK-led alliance: 159 seats
• DMK: 133
• Congress: 18
• VCK: 4
• CPI: 2
• CPI(M): 2
• AIADMK-led alliance: 75 seats
• AIADMK: 66
• PMK: 5
• BJP: 4

That meant the DMK-led alliance secured a comfortable and decisive win, but it still finished below the 175-plus range projected by the most bullish exit polls.

Opinion Poll Vs Exit Poll Vs Actual Result

Opinion Poll

• ABP-CVoter (March 2021):
• DMK-led alliance: 161-169
• AIADMK-led alliance: 53-61
• MNM: 2-6
• AMMK: 1-5
• Others: 3-7

Exit Polls

India Today-Axis My India:

• DMK-led alliance: 175-195
• AIADMK-led alliance: 38-54

ABP-CVoter:

• DMK-led alliance: 160-172
• AIADMK-led alliance: 58-70

Today's Chanakya:

• DMK-led alliance: 164-186
• AIADMK-led alliance: 46-68

Republic TV-CNX / CNX summaries:

• DMK-led alliance: roughly 160-179
• AIADMK-led alliance: roughly 58-69

Actual Result

• DMK-led alliance: 159
• AIADMK-led alliance: 75

Final Party-Wise Result

• DMK: 133
• AIADMK: 66
• Congress: 18
• PMK: 5
• BJP: 4
• VCK: 4
• CPI: 2
• CPI(M): 2

Which Poll Came Closest?

Looking at the numbers, the ABP-CVoter estimates were much closer to the final outcome than the most aggressive projections.

• ABP-CVoter opinion poll: 161-169 for DMK-led alliance
• ABP-CVoter exit poll: 160-172 for DMK-led alliance
• Actual result: 159 for the DMK-led alliance

That made ABP-CVoter the closest among the widely cited projections, while India Today-Axis My India correctly called the winner but overestimated the scale of the DMK alliance win.

The Big Takeaway

The 2021 Tamil Nadu Assembly election showed that the polls were broadly right about the direction of the contest, but not always about the exact size of the mandate.

• Opinion polls had already suggested a DMK-led comeback
• Exit polls strengthened that narrative and, in some cases, projected a much bigger wave
• Actual results confirmed the DMK's victory, but the final tally was closer to the lower end of forecasts than the highest projections