The NY-20 Gillibrand won and served in is not the same as the post-2013 NY-20. That is a historically Republican upstate district (elected the legendary Gerry Solomon prior to John Sweeney, who lost in an upset to Gillibrand in the ‘06 anti-GOP landslide). The seat was reclaimed in 2010 by the GOP and John Faso sits in the seat today, which is now the 19th.
The present 20th is based in Albany, which was the 21st district prior to 2013. That is a historically Dem district that hasn’t elected a Republican since 1968.
I had such high hopes for Chris Gibson (who held it before Faso). Maybe someday he will come back to politics.
I hoped he would be the second US President to come out of Kinderhook! lol