What a nicely desguised way for DNC strongholds to effectively kill off the republican party. By the time a supreme court would be called upon it wouldn't even lift a finger in protest because by then all Wikipedia articles about what Federalism means will be rewritten. Scotus will be told to "not risk democracy" and will recieve the message.
It would be less ironic if this compact wasn't put forward by the same camp that constantly laments gentrification. But when gentrification happens on a intra-state level and states attract so many upper class people that the rural class is effectively nixed out of political representation (eg CA, NY) its not just good, it should directly translate into who gets to decide whos going to be president. Only the urbanites.