Over three million has been spent on the tightly contested race, according to reports, as it represents a chance for State Democrats to gain control of the now GOP controlled State Senate.
Sepulveda, a Democratic assemblyman, defeated Republican Patrick Delices in the New York State Senate 32nd District election on Tuesday.
Simcha Felder has lengthy sat with Senate Republicans, to the frustration of different Democrats.
The 9 races for open state meeting seats Tuesday resulted in 4 wins for GOP candidates, with one saying he'll caucus with Democrats.
In Westchester County, Democratic Assemblywoman Shelley Mayer declared victory over Republican Julie Killian.
Republicans beforehand had a one-seat majority within the 63-seat Senate - plus Felder. But Republicans will stay in charge at least through the end of the legislative session in June thanks to the support of a breakaway Democrat, Sen.
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News 12 reached out to Senate Minority Leader Andrea Stewart-Cousins via Skype in Albany, who tried to put a positive spin on things.
Stern will fill the seat vacated by Republican Huntington Town Supervisor Chad Lupinacci.
Democrats already control the Assembly and hold the offices of governor, attorney general and comptroller. Democrats say they'll now focus on winning a clear majority in November.
"Today's wins will once again give Democrats a numeric majority, and come November we will win even more seats", said the spokesman, Mike Murphy.
Democrats have spent the last month trying to unify in the Senate, with a faction of Democrats who had sided with Republicans dissolving, rejoining the mainline fold.