Dan Donovan was elected to Congress during a special election to replace Michael Grimm.
Richardson received more than 50 percent of the vote on Tuesday, polling results show.
Voters are deciding who will represent the district.
Before going to the polls on Tuesday, May 5, check out DNAinfo's round-up of the candidates.
Menachem Raitport is running as the only Republican candidate in Brooklyn's 43rd Assembly District.
Dan Donovan, Councilman Vincent Gentile and James Lane faced off in a debate Tuesday night.
Democrat Vincent Gentile blasted opponent Dan Donovan for cutting the event short.
Candidates running to replace Karim Camara will now have to run on alternative tickets.
The Brooklyn and Staten Island GOP parties officially selected Donovan as their candidate.
Gentile called out Donovan for not addressing the public after the grand jury decision.
Guillermo Philpotts was tasked with choosing a replacement for Karim Camara, but opted to run instead.
The Staten Island Democratic Party announced Brooklyn's Vincent Gentile is its candidate.
A special election will be held May 5 to replace Michael Grimm and Karim Camara.
A federal judge ruled that Gov. Cuomo had until Feb. 20 to set a date for the election to fill the seat.
Geoffrey Davis, Rubain Dorancy and Diana Richardson may run for Karim Camara's Crown Heights seat.
Get our daily New York City news and alerts!
Thank you for signing up!
Would you like to sign up for additional newsletters?
Thank you for signing up for additional newsletters.