It won’t be hard. Kamala is going to be able to put a bullseye on Trump and republican politics like Biden simply wasn’t ever able to do. She’s going to be able to hyper focus on the deeply unpopular beliefs of the base and it will be hard for Trump or others to really deny it without losing their core supporters.
Further, because she’s relatively unknown there’s really not the same baggage as there was with Hillary. Most people don’t know who she is and I think that really plays to her favor.