It is not the EC per se that has the moderating impact, but rather the winner-takes-all rule. It was originally implemented by the separate states in order to maximize their own impact. Colorado will be shooting itself in the foot by splitting its vote.

As a candidate looks at Colorado, the potential benefit from visiting Colorado and promoting Colorado-friendly policies is large. Colorado’s status as a swing state makes it very attractive to both candidates. If it were to drop the winner-takes-all rule, no one would care about the potential gain or loss of a single EC vote.

If you wanted to maximize your own influence you should establish a group of like-minded centrists who sign a pact to vote as a bloc. This kind of voterís union would multiply the impact of your vote, especially if it were a swing group with unpredictable decisions. Local politicians would beat a path to your door.