What he's really saying is that if he didn't know now what he didn't know then, then he wouldn't have not voted for the resolution, maybe.
lol, good one.
"I, John Kerry, swear that I will not vow to do as I did, when I did not do it, because knowing what I now know that I did not know, I would surely have chosen to not do some things differently, unless something I learned now could change how I felt about something back then, at which point I believe I would've acted appropriate, assuming that inappropriate action was not the most appropriate action, at which point I would have to consult the polls before deciding how much I knew, or did not know when I did or did not do what I was supposed to have done, knowing what I know now."