The main contenders are former MLAs Kedar Gupta and Manoj Singh Kushwaha, fielded by the BJP and Chief Minister Nitish Kumar's JD(U), respectively.
Altogether 13 candidates are in the fray though the contest is being seen as primarily between JD(U)'s Manoj Singh Kushwaha and BJP's Kedar Prasad Gupta.
The by-polls to the two seats are the first election in the state after the formation of the 'Mahagthabandhan' government around three months back.
Deputy CM and RJD heir apparent Tejashwi Yadav led from the front as he addressed rallies both in Mokama and Gopalganj.
The bye-elections, scheduled to be held on November 3, are being watched closely as this will be the first electoral battle since Bihar Chief Minister Nitish Kumar’s JD(U) snapped ties with the NDA.
Amar Paswan, son of Musafir Paswan whose death necessitated the by-election, polled 82,562 votes. His nearest rival Beby Kumari of BJP got 45,909 votes.
This is the first jolt to Sahani after the assembly polls in Uttar Pradesh as he had contested election in Uttar Pradesh on his own and fielded candidates against the saffron party.
The EC announced that by-elections in the states of West Bengal, Chhattisgarh, Bihar and Maharashtra will be held on April 12.
With RJD supremo Lalu Prasad Yadav in jail, it’s his younger son Tejashwi who has kept the party together despite several odds.
Chances of a 'mahagathbandhan' of anti-BJP parties before the 2019 general elections gets a boost in Uttar Pradesh.
The Congress also claimed the BJP had "lost" its simple majority in the Lok Sabha.
BJP blighted in bypolls, loses all three Uttar Pradesh, Bihar Lok Sabha seats including bastion Gorakhpur
The shocker for the BJP came days after its surprise win in three northeastern states, including Tripura, where it scripted history, demolishing the Left citadel of 25 years.
The outcome is bad news for Chief Minister Kumar whose party candidate Abhiram Sharma was beaten in Jehanabad by more than 35,000 votes by RJD's Suday Yadav.
Bihar bypoll results HIGHLIGHTS | RJD wins Araria Lok Sabha seat, Jehanabad assembly seat; BJP wins Bhabua
The counting for the Bihar bypoll has concluded with the RJD emerging victorious in the Araria Lok Sabha constituency and the Jehanabad assembly constituency.
Bihar BJP chief sparks row by saying if RJD's Sarfaraz Alam wins in Araria LS bypoll, constituency will become ISI hub
In Araria, where Muslims account for 41 per cent of the electorate, RJD candidate Sarfaraz Alam is pitted in a direct contest against BJP’s Pradip Kumar Singh.