Come on you can’t be this naive. Biden stepped down because dems made him, despite what you wrote,
What does it mean to not allow Harris to differentiate from his campaign? Or what? Harris made the choice to not differentiate from the Biden campaign. She’s an adult and an unpopular candidate who should own her mistakes.
No, she didn’t have to stick with Biden. She chose to. Again, what would have happened had she taken her distances from Biden after having secured the nomination?