Isn’t their a Libertarian running in KY? That could be his political end...
Not quite sure. Libertarian candidates like most third party candidates are usually gadflies and attract few votes. This is certainly the case in CA. Most voters want their votes to count and know that it is usually a throw away vote to vote third party.
KY is historically a Democrat state which has trended strongly GOP in recent years. Also incumbents usually have the advantage. Further, the party out of power usually win in midterms elections. This is especially true in the sixth year of an incumbent administration.
All factors favoring McConnell’s re-election.