Siddhartha Bhattacharya
He had joined Bharatiya Janata Party in 1995 and was party President of Assam unit in 2014 but was replaced by Sarbananda Sonowal ahead of 2016 Assam Legislative Assembly election . 
<triplet> Sarbananda Sonowal <subj> Bharatiya Janata Party <obj> member of political party <triplet> 2016 Assam Legislative Assembly election <subj> 2016 <obj> point in time