Gopalakrishna, a six-time MLA, was earlier with the Congress but joined BJP after the grand old party denied him a ticket to contest elections in 2018.
State unit President D K Shivakumar said BJP and JD(S) legislators joining the Congress voluntarily is a "big evidence" that people have decided for a change, after the "failure of the double engine government"
A four-time MLA from Arkalgud in JD(S) home turf of Hassan district, Ramaswamy has been vocal about his differences with the party leadership in recent days.