If nothing else, let this be a lesson in two things: How much people will humor you if you’ve got enough money, and two, realizing that and knowing when to quit. And so it comes to pass that Tom Knox (pictured), whom 57% of Philadelphians did not recognize in a poll despite spending $13M on a campaign in the last mayoral election, will not be running against Mayor Michael Nutter. Knox now joins the ranks of Sam Katz and just about every other Philadelphian who’s not running for mayor, thus leaving Nutter at this moment running basically unopposed, unless you count Milton Street (we don’t) or Republican John Featherman (ditto). It’s a bizarre situation, given an ongoing dialog out there right now, debating whether or not Nutter’s first term was even worth a damn. If nothing else, though, Knox’s bowing out — which he’ll formally announce this morning at the Bellevue, alongside Ed Rendell, who’s also (surprise) endorsing Nutter — robs this blog of nearly a year’s worth of “Tom Knox, who he?” jokes. We’ll remember this, Knoxy. Or… not.