Don't know if they are included in the link, but here are some kinescope recordings of the TV coverage from 1948 DNC (WPIX), the 1948 Presidential election (NBC), and the 1956 Presidential election (CBS). There was earlier TV coverage of the 1940 and 1944 Presidential elections, as well as the 1946 midterm election, the 1945 New York Mayoral elections, and possibly a small amount of coverage by CBS of the 1942 midterm elections on their weekly news summary program, but methods to record TV broadcasts were not introduced until 1947, so no recordings of those broadcasts exist.
https://youtu.be/tas3kJkFKiEhttps://youtu.be/WsHwnGoZHy0https://youtu.be/J7wdcYh7oIg
