How a 5–6% Vote Gap Changed Everything in Tamil Nadu | DMK vs AIADMK 2021 Explained

Tamil Nadu’s 2021 Assembly election shows how a small vote gap can translate into a major political shift. The DMK-led alliance secured around 45% vote share, while the AIADMK-led alliance stood close to 39%, creating a 5–6% gap. In a strongly bipolar political system, this difference resulted in a major seat swing, with DMK winning 159 seats out of 234 and forming the government, while AIADMK was reduced to 75 seats. This explainer breaks down how Tamil Nadu’s electoral structure converts vote share into seats, why alliance politics matters more than fragmented votes, and how even a small percentage gap can decide power in the state.