Actually it IS about the Democratic party because it is the Democratic Party members that are demonstrating how we don't like what is going on one bit.
And the Democratic Party through the members are very concerned about the negative effect this is having on a Democratic Party's nomination process and that this type of campaign may well keep going to not good consequences in the GE come November which is why those numbers are now tanking.
If the past holds true, these changes will be temporary though.
This is but the latest one we'll wait and see what the next move will be from the Clinton camp.