Akhtarul, known for his vocal advocacy of secularism, told the media that his presence in the election fray would divide Muslim votes and thus help the Bharatiya Janata Party's Dilip Jayswal.
"I have decided to sacrifice (myself). Now Muslims will vote in favour of the Congress candidate and outgoing MP Ashraraul Haque," he said.
He said the BJP was seeking to divide Muslim votes to ensure a consolidation of Hindu votes in favour of its candidate in the April 24 ballot.
The Congress candidate is also supported by the RJD of Lalu Prasad.