You're wrong about the viewership levels in 2004 and wrong about the numbers for Hillary.
CORRECT: Hillary lifts convention ratings; CNN again leads cable - MarketWatch
She moved the needle from 22.3 million on Monday to 25.9 million on Tuesday. A nice gain of 13%, but not quite as dramatic as you posted.
NielsenWire » Historical TV Ratings: Democratic Conventions
15.5 million viewers on average watched the 2004 DNC.