Just to follow up on Congress trying to undo the results of Kelo, even though people have moved on.

In this case, it’s not really that they’re making a law to “overrule” the Supreme Court. What was ruled in Kelo was that the seizure by eminent domain was allowed by the Constitution. That is, the power of the government extends that far. The government can still say “Well, we won’t use that power.”, which is what the federal government is basically considering here.