I was pissed, but.... the pro-Harris wave is stronger than I expected and the Dem party seems to be sweeping toward a consensus. This change may have injected a level of enthusiasm into the campaign that wasn't there before, and it has for certain unsettled the Trump camp. They based their VP choice and campaign strategies on belittling Joe Biden -- now, all that saliva-speckled venom has gone to waste.
Trump is far less comfortable facing a woman opponent, not to mention a black woman! Anything that unsettles him -- loss of limelight, change of tactic, uppity females -- is useful.