This is the first Newton election since at least 2001 in which there were no council/alderfolk upsets; incumbents who ran won. (I can’t find the 1999 results, so can’t tell who was an incumbent in 2001.) And, slightly less rare, all 24 incumbents ran. (Two of the incumbents — John Oliver and Tarik Lucas — held their seats for a partial term after winning them in the March special election.) 

The lack of upsets can’t be attributed to few contested races. This year’s eight contested races (four at-large and four ward) is relatively high in this century.

The power of incumbency is particularly interesting given that the field divided itself into two very distinct, issue-oriented, candidate-defined slates, with only one candidate — Jim Cote — not falling neatly onto one list or the other. Incumbency trumped slate.