Here's a lengthy piece, with many on-point quotes, that describes the situation.
In 1920, for the first time, the Census Bureau counted more people living in urbanized America than in the countryside. This hasn't been a rural nation ever since.and this
The Electoral College is just one example of how an increasingly urban country has inherited the political structures of a rural past. Today, states containing just 17 percent of the American population, a historic low, can theoretically elect a Senate majority.
Not to mention that the Red state whiners consistently are net moochers on the Federal purse:
Red states are twice as dependent on the Damn Gummint than the Blue States. Of course.
The only near term solution is the 270 state compact. I suspect that a Roberts' court will declare it unconstitutional, since it evades one interpretation of the state/Senate sovereignty clause. Hopefully, we get to find out.