Several students asked about private discrimination in housing,
employment and public accommodations. They basically said "if the
Constitution doesn't forbid private discrimination, what does?"
Of course, the answer is civil rights statutes and ordinances enacted by Congress, state legislatures, or local government.
Most
constitutional law cases arise because some law enacted by Congress or
the states restricts some constitutional right. Nebraska passes a law
forbidding certain kinds of speech. The law is clearly state action (the
speech restriction is written into the statute), this triggers the Free
Speech issue, and the law may or may not violate the Free Speech
Clause. Congress passes the Health Care law with an individual mandate.
Clearly this is state action and the law may or may not violate the
Constitution (the Court upheld it as a tax, as you may remember).
If
a private landlord discriminates on the basis of race, there is no
state action so no constitutional claim. But the discrimination
certainly violates any number of fair housing laws passed by Congress,
the states, and many cities.
I hope this helps clarify any confusion.