https://lists.debian.org/debian-ctte/2014/02/msg00294.html
https://lists.debian.org/debian-ctte/2014/02/msg00283.html
https://lists.debian.org/debian-ctte/2014/02/msg00297.html
https://lists.debian.org/debian-ctte/2014/02/msg00282.html
For anyone wondering, 4 votes are enough because Bdale's vote (the chairman of the Technical Committee) count as two votes in case of a draw.
EDIT: see this (https://news.ycombinator.com/item?id=7203479) comment below - if the other 4 members of the TC vote F, then systemd would not win.