I see this as incredibly challenging for the American Democratic Party to overcome. A conservative is very clearly defined and makes up a huge portion of the country: white and religious. The inverse of this (multicultural, non-religious or non-Christian, many different races/nationalities) is much more challenging to speak to and motivate.

A republican ad can cast a standard white nuclear family wearing some blue jeans and their base will love it. Democrats don’t have a super obvious cast (and message).