Exit polls: A snapshot, not a forecast

Without dwelling on the April 29 theatrics surrounding exit polls after the final votes were cast in the second phase of the high-stakes West Bengal Assembly Elections—with even a leading pollster hesitant to make firm predictions—the larger point is clear: such surveys must be treated with a fair degree of caution.

Past experience shows that many exit polls have missed the mark, often leaving their authors embarrassed. At best, they offer a brief snapshot of voter sentiment and a bit of post-campaign relief or entertainment, rather than reliable data or accurate forecasts.

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Experts note that the accuracy of exit polls is undermined by multiple structural and psychological factors, often creating a gap between projections and actual results. One major limitation is sampling bias—it is difficult for any pollster to capture a truly representative cross-section of voters across rural and urban areas, genders, age groups, and economic backgrounds within just a few hours of polling.

There is also the serious issue of non-response and inaccurate information. Many voters may refuse to participate or may provide incorrect inputs. In politically polarised environments such as West Bengal, respondents may conceal their true preferences—the so-called “shy voter” effect—for various reasons.

The biggest shortcoming, however, lies in translating limited data into seat projections. Even a small error in estimating vote share can lead to large miscalculations in seat outcomes, turning a projected landslide into a narrow victory, or vice versa.

India’s electoral history offers several examples. In the 2015 Bihar Assembly Elections, exit polls underestimated the scale of the Mahagathbandhan’s victory. In 2020, they predicted a comfortable win for the same alliance with around 125 seats, but the results went in favour of the BJP-led NDA.

Similarly, in the 2024 Indian General Election, most pollsters forecast a sweeping victory for the BJP-led NDA—projecting over 350 seats—while the alliance ultimately secured around 295, with the BJP itself winning 240 seats.

There are several other instances where exit polls failed to accurately capture outcomes, including the 2015 Delhi Assembly Elections, the 2023 Chhattisgarh Assembly Elections, and even the 2021 West Bengal Assembly Elections, where the final picture became clear only after counting.

The bottom line is that exit polls have had a mixed track record—both good and bad—and should be viewed with scepticism, particularly in closely contested or complex elections. In states like Tamil Nadu, where new political entrant Tamilaga Vettri Kazhagam (TVK) is reshaping the landscape, or in West Bengal, where political polarisation and evolving dynamics add layers of uncertainty, exit polls are best taken with a pinch of salt.