CNN's debate in Arizona Wednesday night drew 4.73 million total viewers from 8-10 p.m., according to Nielsen fast nationals.
The 20th and likely final debate of this election cycle, moderated by CNN's John King, also delivered 1.4 million viewers in the target adults 25-to-54 demo.
It was the least-watched debate since NBC's Meet the Press debate on Jan. 8. (which drew 4.71 million viewers) and ranked 13th of the 19 Nielsen-rated debates.
Bolstered by the debate lead-in, Anderson Cooper 360 won the 10 p.m. hour, topping Fox News Channel's On the Record by 35% among total viewers and MSNBC's Last Word by 106%.
The debate's west coast primetime airing added an additional 941,000 total viewers and 434,000 in the key demo.