Those are 2 separate issues that should not be tied together. DC citizens shouldnt have their rights marginalized to make CA citizens less marginalized. The answer should be that we try and make all votes count equally in the House and Presidential elections, and that in the Senate is 2 per state irrespective of population.
The sad part is that as populations move, these ideas could burn Democrats in the future. But doing the right thing isnt about wins or losses.