Elizabet Warren, followed by other Democratic candidates, has expressed support for abolishing the Electoral College. In two of the five elections in the 2000s, the Electoral College vote has differed from the popular vote and put the popular vote loser into office. This trend could easily continue if small red states have disproportionate power compared to larger blue states in the Electoral College.
A way around a constitutional amendment would be for states to agree to give their electoral votes to the popular vote winner. Some states have passed this idea (National Popular Vote) but it’s not up to 270 electoral votes yet. I would not expect Republican states to support it since they benefit from the current system. Here are some recent discussions of the issue. Whether changes are made or not, it’s good that the topic is being discussed seriously.
Make sure to read the tweet below that points out that most of the 2016 presidential campaign events were in a few states.