1) My husband watches a lot of trashy TV at night—not that I don't have my guilty pleasures, too, mind you.
w=not+that
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Hasibrahmannot that ...
Probably the easiest paraphrase for the usage you've illustrated with your examples is
~ but don't think that what I just said means that ...
Wouldn't it be better if we did away with campaign finance limits? Not that I will ever be able to give anything approaching $2,300 to a candidate. ~
Wou