He defeated his nearest opponent by 14195 votes and became Member of Assam Legislative Assembly for Rangapara, succeeding Golok Rabjanshi.

In the 2006 Assam Legislative Assembly election Tanti was again the Indian National Congress candidate for Rangapara.

In 2009, sitting AGP MLA Joseph Toppo was elected to the Lok Sabha which triggered a by-election in Dhekiajuli.

Tanti was the Indian National Congress candidate for the constituency and defeated his nearest competitor by over 21000 votes.

[3] Instead of seeking reelection in Dhekiajuli, in the 2011 Assam Legislative Assembly election Tanti instead sought the Rangapara constituency.