[1] While originally a staunch supporter of the death penalty, Slattery later came to oppose it, with his vote against a 1997 bill to reinstate the practice in Massachusetts causing the resolution to fail.

[2] Slattery ran for lieutenant governor of Massachusetts in 2002, but lost the Democratic nomination to Chris Gabrieli.

[3] He was a candidate for mayor of Peabody in 2005, but lost to incumbent Michael Bonfanti.

[4] In 2012, John announced his plans to run for Massachusetts State Senate.

[5] He lost the Democratic primary to Joan Lovely, then a member of the Salem city council.