The prime-time matchup on Thursday between President Biden and former President Donald J. Trump represents an evening full of promise and peril.
Especially for CNN.
For the first time in decades, a single television network will have sole discretion over the look, feel and cadence of a general-election presidential debate. Unlike in past years, when an independent, nonprofit commission oversaw the contests, CNN has picked the moderators, designed the set and will choose the camera angles…