Nearly everything presented by each politician is random (8)
I believe the answer is:
aleatory
'random' is the definition.
(thesaurus)
'nearly everything presented by each politician' is the wordplay.
'nearly' means to remove the last letter.
'everything' becomes 'all' (all things).
'presented by' is a charade indicator (letters next to each other).
'each' becomes 'ea' (abbreviation).
'politician' becomes 'tory' (term for a Conservative Party politician).
'all' with its final letter removed is 'al'.
'al'+'ea'+'tory'='ALEATORY'
'is' acts as a link.
(Other definitions for aleatory that I've seen before include "depending on chance" , "dependent on chance" .)