Made every effort to confuse voters (6)
I believe the answer is:
strove
'made every effort' is the definition.
(I've seen this before)
'confuse voters' is the wordplay.
'confuse' is an anagram indicator.
'voters' with letters rearranged gives 'STROVE'.
'to' is the link.
(Other definitions for strove that I've seen before include "Tried hard for voters" , "Struggled" , "Voters (anag) - made every effort" , "Made great efforts" , "Endeavoured" .)