How about a middle-aged career politician who is his major party's candidate to run the economy telling a small and sympathetic audience that he was a Marxist and the 2007/8 financial crash was an opportunity he'd been waiting for for a generation? That's an actual example from British politics, albeit an MP so known for making unfortunate remarks that there were probably journalists willing to manually trawl through weeks worth of footage of fringe meetings he attends to find the most outrageous ones, but there's no doubt a tool like this could yield better results.

For better and (mostly) for worse, dredging up muck from student days has been around since the dawn of politics, and at least in the UK we're comfortable enough about the fact people change for even a Conservative Party chairman to be willing to volunteer they were a radical Marxist in their teens. Being able to rapidly cross-reference everything a politician has said on record on a given subject in recent years is a new and far more useful way of subjecting them to scrutiny.

This is less about the specific case of Trump's sex remarks (which was obviously a case of somebody knowing their secret video was dynamite and waiting for the right time to light the fuse) and more about the difficulty of establishing whether Trump was telling the truth about having opposed the Iraq war all along, which is where efficient search of stuff that's already in the public domain but not necessarily in the public consciousness comes in really, really useful.