Tamil Nadu Elections: Who Gains If Congress Dumps DMK For Vijay’s TVK?

As Tamil Nadu heads toward the 2026 Assembly elections, speculation over a possible split between the Congress and its long-time ally DMK - and a potential tie-up with actor-politician Vijay's Tamilaga Vettri Kazhagam (TVK) - is emerging as one of the most consequential political developments in the state. If such a shift materialises, it could transform what is now largely seen as a bipolar contest into a triangular battle with unpredictable consequences.

Strains within DMK-Congress alliance

The DMK and Congress have shared a durable alliance in Tamil Nadu, helping the DMK secure power in 2021 with 133 seats and a 37.7% vote share. However, tensions have reportedly been rising over seat-sharing and power-sharing arrangements ahead of the 2026 polls. Some Congress leaders in Tamil Nadu believe the party's prospects are constrained under the DMK's shadow and have publicly expressed dissatisfaction.

Their frustration is rooted partly in electoral arithmetic. In the 2021 Assembly elections, the DMK contested 173 seats, limiting Congress to just 25 constituencies. This strategy allowed the DMK to absorb part of Congress's traditional vote base. Congress's vote share dropped significantly compared to the 12.5% it had secured in the 2019 Lok Sabha polls, highlighting how alliance dynamics can reshape party strength.

Now, Vijay's TVK has reportedly reached out to Congress, offering an alliance that could revive the national party's independent relevance in the state.

TVK's rise and Congress's dilemma

Vijay's TVK, though new, is already attracting attention. Surveys suggest the party could secure between 12% and 15% vote share, driven largely by support among youth and women. An alliance with Congress - which still retains organisational strength across districts - could push this combined vote share closer to the 20% mark, making the partnership electorally significant.

For Vijay, the gains would be substantial. Despite his massive popularity, TVK lacks the political legitimacy and organisational depth that established parties possess. A tie-up with Congress would instantly confer credibility, helping TVK shed its image as merely a celebrity-driven outfit and positioning it as a serious electoral contender.

For Congress, the alliance offers a chance to contest more seats and rebuild its independent political base rather than playing junior partner to the DMK.

A blow to DMK, but uncertainty for Congress

If Congress breaks away, it could deal a serious blow to the DMK. Even a modest erosion of 5% to 10% vote share could hurt the ruling party in closely contested constituencies. Historically, such shifts have had dramatic effects.

For instance, in 2006, the DMK secured just 26.5% vote share but formed a minority government because its allies contributed additional votes. Notably, when alliances weakened, outcomes shifted dramatically - as seen in 2001 when the AIADMK swept to power.

Congress could play a decisive "spoiler" role, splitting votes and weakening the DMK's hold.

However, the move carries risks for Congress as well. If it eats into DMK's votes, the biggest beneficiary could be the NDA, allowing it to emerge victorious even without a dominant vote share.

Who really benefits?

Political observers outline multiple possible outcomes.

In one scenario, a Congress-TVK alliance cuts into both DMK and AIADMK votes, enabling the new alliance to emerge as a credible third force and win a meaningful number of seats. This would mark Vijay's arrival as a major political player and revive Congress's relevance.

In another scenario, the split weakens the DMK's vote sufficiently, but will allow the NDA to win.

There is also a third possibility: the DMK could still emerge as the single largest party, forcing Congress to negotiate post-poll support - this time from a position of greater strength.

National implications

Beyond Tamil Nadu, the consequences could ripple into national politics. The DMK is one of Congress's most reliable allies in Parliament and a key pillar of opposition unity against the BJP. A split could weaken Congress's coalition strength at the national level.

A high-stakes gamble

Ultimately, the decision presents Congress with a difficult choice: remain in a stable alliance with limited growth, or gamble on a new partnership that could revive - or further diminish - its political fortunes.

If Congress joins hands with TVK, Tamil Nadu's 2026 elections could become the state's most unpredictable political contest in decades, reshaping alliances and redefining power equations for years to come.