"Ryan's mother was a hamster?'

"Criticism of policy proposals is not the same thing as an ad hominem attack.

"If I say that Paul Ryan’s mother was a hamster and his father smelt of elderberries, that’s ad hominem. If I say that his plan would hurt millions of people and that he’s not being honest about the numbers, that’s harsh, but not ad hominem." 

-- Paul Krugman has more on Truthout. 

And Ryan's mother wears combat boots.