Still, Roberts seemed to leave the door open to other abortion challenges.
Like a Texas case from 2016, the Louisiana law required abortion providers to have admission privileges at hospitals near their clinics.
It was another example of Roberts seemingly now taking on the role which had long been occupied by former Justice Anthony Kennedy - the centrist vote between two battling factions of four conservative and four liberal justices.
In recent weeks, Roberts has provided the fifth vote to stop the Trump Administration from ending the DACA program, to extend anti-discrimination protections to LGBTQ workers, and to allow states to limit church services because the Coronavirus outbreak.
"We are winning these cases by the skin of our teeth and because Roberts fears for the Court's legitimacy with the public," said Brian Fallon, who leads a progressive group demanding change on the Supreme Court.
The latest decision from Roberts prompted immediate grumbling among conservative Republicans.
"What’s next, Chief Justice Roberts? Our Second Amendment rights?" tweeted Rep. Jim Jordan (R-OH).
But while Democrats celebrated the unlikely victory today, they also reminded their voters of the importance of the upcoming election.
"Another reason 2020 will be the most important election of our lifetimes," said Rep. Joe Cunningham (D-SC).