The founding fathers did not predict that a few states would become hyper-partisan and stop giving EC votes proportionally. The few states, early on, did this because they were decidedly red/blue and wanted a bigger say in who is president. A bunch of other states wound up following suit to level the playing field.

Now, we have winner-takes-all for almost every state. Now, politicians don't spend time pandering for votes they already have locked.

It created the concept of "battle ground states".