With Sens. Ron Johnson’s (R-Wis.) and John Thune’s (R-S.D.) recent announcements that they will seek re-election, all incumbent senators up for re-election in 2022 have made their decisions. Twenty-eight senators are seeking re-election—15 Republicans and 13 Democrats. Six senators are retiring—five Republicans and one Democrat. This is the highest number of Republicans not seeking re-election since at least 2012.
In every election cycle within that time until the current one, either two or three Republican senators did not seek re-election. The number of retiring Democrats has ranged from zero to six.
