The vote margin for the nation was 2.9 million votes.
California alone provided a popular vote margin of 4.3 million votes for Clinton. The Governor's office was not on the ballot. The Senate race was between two Democrats. The 53 representative districts nearly are districts dominated by one party or the other, only 17 are represented by Republicans. There was little incentive for Republicans to vote in California.
In Illinois, there was no Governors race. There was a Republican Senate candidate. There was little difference between the two candidates, both were progressives. In Cook County it is pointless for Republicans to even field candidates in nearly all races. The popular vote margin in Illinois was nearly a million votes for Clinton.
In New York the margin for Clinton was 1.7 million. I haven't looked closely at New York but my guess it is similar to California and Illinois.
My view is the existing system isn't perfect but the Union was formed under a system that provided the citizens of all states to have a voice. States joined the union under that premise and to change the rules invalidates the justification for entering the union.
i understand the entire objective of the effort is to "cast a cloud over trump's presidency".
i suppose an argument could be made the rules for the democratic primaries "cast a cloud over clinton's candidacy and she did not have a clear mandate from the people" that voted in the democratic primaries.