[CyberCowboy777]

Why did Tom hold back on Arnold?

A deal?

[pogo101]

Why did Tom hold back on Arnold? A deal?

I suspect no, not yet anyway; Tom's too principled to do that. But he knows that his chances of winning are minimal now, and he wants to be able to garner mainstream GOP support in the future. If he savaged Arnold like this was his (Tom's) last ever race, and lost, Tom's name would be mud with 60% or so of the GOP supporters for decades.