In 2012, Kathy Marchione defeated Roy McDonald in the Republican primary for state Senate.
Now, Marchione is retiring and her legislative director, Daphne Jordan, is running for the seat.
The Democrat challenging Jordan is Aaron Gladd, a former aide to Governor Andrew Cuomo.
Today, Republican former Congressman Chris Gibson endorsed Jordan.
But Gladd is getting support from GOP former lawmakers, too.
Former state Senator Roy McDonald joins explains why he's backing the Democrat in this race.