Did anyone stand with Scalia? Thomas or Alito?
Justice Scalia dissented and said that he would have upheld the entire law. Justice Thomas likewise would uphold the entire law as not preempted by federal law. Justice Alito agreed with Justices Scalia and Thomas regarding Sections 5(C) and 6, but joined with the majority in finding Section 3 preempted.
https://en.wikipedia.org/wiki/Arizona_v._United_States
And, see post 21 for link (Scalia and Thomas wrote dissenting opinions)