Just in case you did not look up what means, I give you some meaning:
Adj.1. ignominious - (used of conduct or character) deserving or bringing disgrace or shame ignominious - (used of conduct or character) deserving or bringing disgrace or shame.
A pasquinade is a satire or lampoon.
I believe the author thought Sarah efforts at satire brought her disgrace.
However, I think differently. Sarah’s lampoon of the foes of Conservativism bring them disgrace. Those who heard her words understand and would agree that the Left is disgraceful.
Whatever it is, it is bad writing.