Do we not already see this? McCain was already the republican nomination when my state finally voted, and we never saw a presidential candidate here.
Regardless, it would mean the small states NEVER get their way as a rule, and they would be angry about it. The proportion of big-city Dem votes would possibly be much more than in electoral. It is electoral which makes them more likely to get something they want, rather than ALWAYS being at the mercy of big cities.
In my state of MD about 10 years ago, legislators from the Eastern Shore threatened to secede (and Western MDers would probably copy them) because it’s always the Baltimore-DCarea vote that wins the state, for every state-based election. This tiny proportion of the state rules the entire landscape, mostly because there is NO electoral-type system. Hence alot of disgruntlement and discontent amongst those who never get their way.