You can read about it on wikipedia: Edwards v. Aguillard

Note that only two judges dissented, one of which is still on the court: Scalia.

If Obama is re-elected, there’s a decent chance that Scalia would be replaced during Obama’s second term. Scalia is now 76, and while he may be healthy for a few more years, at that age decline can happen rapidly.

Replacing Scalia, if it happens, by a less ideological jurist would be one of Obama’s major positive accomplishments.