 in what was the biggest moment of the presidential campaign so far. Before last night's debate, the chance of replacing Biden at the Democratic National Convention as the nominee was zero. Now there are actually open discussions about it, even though it's still highly unlikely. That's NPR's Domenico Montanaro. In a major ruling, the Supreme Court undid decades of regulatory law today. The vote was 6-3 along ideological lines. NPR's Nina Totenberg reports.