I wonder if he was the last Senator. Old Walter Johnson-legacy Senators I mean - not the ones who became the Rangers.
http://www.baseball-reference.com/teams/WSH/1960.shtml
Jim Kaat would have been the last one to retire from Major League Baseball, 1983.
Look at the stats on that team and no one would pick them to be in the World Series five years later. I'd even go so far as to rank the 1965 Minnesota Twins as one of the top 40 teams which ever played the game. Yeah, I know, they lost to the Dodgers, but that Dodger team was maybe one of the top 20.