http://en.wikipedia.org/wiki/New_York's_23rd_congressional_district
NcNulty was 23rd district Representative until redistricting put him in the 21st district.
According to the Wikipedia article above, there were 16 other Democrats to hold the 23rd district seat since 1865.
technically she is correct in saying that the dems won last night. The picked up the seat from new york, plain and simple. All be it, they may have only won by a point, but they did win.