[carbadtraingood]

"Across the board" means "in every instance" not "in aggregate", at least in my experience.

[lotsofpulp]

Yes, that is correct. I was misremembering what I read. It was

“across the three major cable news networks”

Which I paraphrased as

“Across all the channels”

Which the person replying to me changed to

“Across the board”.