No, politicians would not need to visit California because the way in which the electoral college is being eliminated is by keeping it intact, but forcing the state electors to follow the federal trend instead of the local one. The result will be ALL of California's electors going "blue" regardless of how the individual people vote. If we figured out a way of actually eliminating the electoral college, then it's entirely possible that a presidential election would result in no candidate winning more than 50% of the popular vote, and there would need to be some way to conduct a run-off election. If this scenario had unfolded in the 1992 election, Bush would have won instead of Clinton.