First, the states are not equally represented. California gets more electors than Texas, which gets more electors than Michigan, which gets more electors than Montana. The representation is supposed to be proportional, not equal.
Second, that doesn't change the fact that the Constitution gives state legislatures the power to choose electors however they see fit. "Each State shall appoint, in such Manner as the Legislature thereof may direct..." As long as the method does not violate some other portion of the Constitution (as martybegan has argued this national popular vote system does), the state legislatures can pick electors however they want.
I'm not arguing that the EC should be abolished here. I'm just pointing out that Article 2, Section 1 gives state legislatures the power to pick electors using whatever method they decide is best. States haven't always had their citizens vote when choosing electors, and electors are not bound by the Constitution or federal law to vote in accordance with the results of state elections.