REPORT: Five key arguments loom in SCOTUS gay marriage cases...

State bans on same-sex marriage have been justified based on judicial precedent, states' rights, regulating procreation, optimal child-rearing and centuries-old tradition. Those reasons also have been loudly debunked.

When it convenes April 28 for one of the most historic oral arguments in its 226-year history, the Supreme Court will hear all of those arguments and more from five lawyers representing gays and lesbians on one side, and the states of Kentucky, Michigan, Ohio and Tennessee on the other. But the justices also will have read what dozens of federal trial and appeals court judges have written.

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