A modest search engine proposal

How much AI technique could it possibly take for google (or something better) to do a decent job with

speechby:obama   attitude:positive   "Saul Alinsky".

I.e. "speechby:" and "attitude:" don't exist, but could, I believe be implemented pretty accurately, to see in this case if we can find any instances of Obama praising Saul Alinsky.
An article: "Bill Ayers and Obama Both Quote Alinsky" claims such quotes exist, but their one attempt to demonstrate it is laughable -- something vaguely like a paraphrase of an Alinsky statement, but which has, in fact the reverse sense of what the supposed "original" meant.