Those who quit included deputy chief minister Y JoyKumar Singh.
The victory was marked with the support of 32 of the total 60 MLAs in the assembly.
Governor La Ganesan and Chief Minister N Biren Singh were among the early voters in their respective constituencies of Sagolband and Heingang.
Eight Congress MLAs skipped the proceedings, defying a party whip.
The Central Bureau of Investigation on Thursday night arrested a Mumbai-based chartered accountant and two government officials for allegedly selling confidential documents related to foreign investment policy to corporate groups after it carried out searches in offices of Finance and Commerce Ministries in New Delhi and in Mumbai.
Probe reveals "first and second" level of decision making in ministries of finance and commerce was "compromised".
Jet-Etihad deal documents among those leaked: CBI
6 locations in New Delhi and 2 in Mumbai were raided.
The ban has been in force since last Friday.
CBI has also summoned a senior official of Reliance Industries Limited and a noted chartered accountant.
