I used Google. The technique that I use for finding exact quotes in Google is to first try the whole quote (or a whole sentence from the quote) enclosed in quotation marks, and if that doesn't find it, then select and search on smaller exact phrases from the quote that have a good chance of uniquely distinguishing the whole quote, and if that doesn't work, select a set of individual, specific words from the quote and search without the quotation marks, until I either find it or give up.
(I found the link to your post on my second try - I forget exactly what I used as search terms, but I believe that it was an exact phrase towards the middle or end of the quote published by MSNBC.)
BTW, congratulations on your newly-found fame - it was a great (and fitting) quote...
Thanks for the information and thank you for finding it --- I do recall making that post and I still would love to be able to read her thesis.