I did a search and didn’t see it.
The Newsweek article:
The “Outlandish” McCain Offer. Kerry’s courtship of Senator John McCain to be his running mate was longer-standing and more intense than previously reported. As far back as August 2003, Kerry had taken McCain to breakfast to
sound him out to run on a unity ticket. McCain batted away the idea as not serious, but Kerry, after he wrapped up the nomination in March, went back after McCain a half-dozen more times. “To show just how sincere he was, he
made an outlandish offer,” Newsweek’s Thomas reports. “If McCain said yes he would expand the role of vice president to include secretary of Defense and the overall control of foreign policy. McCain exclaimed, ‘You’re out of your
mind. I don’t even know if it’s constitutional, and it certainly wouldn’t sell.’” Kerry was thwarted and furious. “Why the f-— didn’t he take it? After what the Bush people did to him...’”
http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/11-04-2004/0002356222&EDATE=
So this is probably Kerry reinventing history yet once again.
McCain discussed it with him though, so who knows what was discussed.