Why did Supreme Court liberals take the conservative position in Gonzales v. Raich?

[Bandit3 the Worker]

Gonzales v. Raich was the Supreme Court ruling that upheld the George W. Bush regime's efforts to criminalize cannabis even in states that had allowed medical cannabis.

But the court's liberals adopted the right-wing authoritarian "law and order" stance, while most of the conservatives took the more liberal stance. An exception to the latter was Scalia, who was usually right-wing across the board.

How did this happen? The Bush regime clearly had no legal grounds to pursue its war on cannabis, but how is it that the more liberal Justices sided with Bush?

[lfromnj]

Because liberals/leftists need to stop chicken farmers from growing their own food for their chicken otherwise society collapses to them.
If the other side won in Raich that would have meant a vastly different commerce clause interpretation that came from the New Deal.