Cantor's defeat didn't doom immigration reform — it was already doomed

The fact that David Brat and Eric Cantor, though both anti-immigration hardliners, spent so much time attacking each other as soft on immigration has led to a lot of immigration-related morning-after spin. Is Brat's victory a thundering defeat for the forces of reform? Or should we pay more attention to things like Eric Cantor's penchant for big-spending on Beltway fundraising or his disagreement with Brat about the NSA?