1988 United States Senate election in Maine
Angus King , who was elected in 2012 and reelected in 2018 , is an independent who caucuses with the Democrats , but is not actually a member of the party . 
<triplet> 2012 <subj> Angus King <obj> successful candidate <subj> 2018 <obj> followed by <triplet> 2018 <subj> 2012 <obj> follows