By following that policy, they undermined their argument for keeping the roof closed during their home World Series games.

Yet again, you try to undermine your opponent's argument by making them appear intrinsically bad, rather than dealing with the content of the argument.

These facts undermine your central argument against the Senate approach.

Postrel seems to think that conceding+a market role in consumer behavior would undermine her biological argument.

In the end, Postrel undermines her main argument when she shears aesthetics of objective value.

Perhaps you ignored this because it is inconveniently undermines your argument ?

The minute anyone starts resorting to insults it undermines their argument.

By so doing, you have, in effect, totally undermined your own argument.

The Narathiwat raid undermines the government's argument that violence is decreasing in the region.