The most fair and effective counterclaim against the argument in favor of the Electoral College is:
"Everyone knows that each voter should have only one vote, and the Electoral College makes it possible for some people’s votes to count as more or less than one."
This counterclaim directly addresses the core issue of equitable representation in voting. It highlights a fundamental principle of democracy—one person, one vote—and critiques the Electoral College for potentially distorting this principle, making it a more compelling and relevant challenge to the argument in favor of the Electoral College.