Adverbial Clauses--Two warnings about

Here's the first sentence of a pretty good column in today's University of Tennessee Daily Beacon:

"This last election has seen a rather interesting polarization of American politics, something of which I have been guilty myself, such as when I wrote a column after the health care vote on how Democrats were trying to destroy America."

It conveniently illustrates both warnings in the Ruge Rule below -- about adverbial phrases as predicate nominatives and as objects of prepositions.

Corrected:

"This last election has seen a rather interesting polarization of American politics, something of which I have been guilty myself, such as [when] the time I wrote a column after the health care vote [on how] asserting that Democrats were trying to destroy America.

Here's an SAT Question of the Day that turns on the same rule:

British author Charles Dodgson, best known by his pen name, Lewis Carroll, is renowned for when he wrote two of the most famous and admired children’s books in the world, Alice’s Adventures in Wonderland and its sequel, Through the Looking-Glass.
A. is renowned for when he wrote
B. renowned in that he wrote
C. received renown, he wrote
D. is renowned for writing
E. was renowned and wrote

From Ruge Rules

1) An adverbial clause may never be the object of a preposition.

Wrong: I suppose death is like when you go to sleep and don't wake up.
Right: I suppose death is like going to sleep and not waking up.
(Note: in correcting for the used of the adverbial clause as the object of the preposition "like," we are automatically correcting for the used of the indefinite "you.")

2) An adverbial clause may never be used as a predicate nominative.

Wrong: The reason I like my math class is because Doc Arnds keeps me on my toes.
Right: The reason I like my math class is that Doc Arnds keeps me on my toes.

Wrong: Cheating is when you copy someone else's work.
Right: Cheating is copying someone else's work.