They do so with voting in primaries and the general election. All pretense that we are voting for statesmen as electors is gone. They are now simply nameless and faceless minions of popular vote. They not a deliberative nominating body the founders envisioned. The founders' fear that smaller states would lack representation is exacerbated under the current electoral system.
Voter turn out currently has no relevance.
A California voter has 2.663 times the potential for determining the presidential outcome than a citizen of Montana. If Mr. Gore wins, he will do so carrying only New York, California, Illinois, Pennsylvania, and 13 other states. Gore carried the country's special interest borders. Mr. Bush carried its heartland but fights for victory only in Florida. The founders' contemporaneous writings reflect fear of corruption, vote recounts, and resulting delays in popular votes that would cripple the nation.