Conversation so far:
who won the gubernatorial race in south carolina
Henry McMaster won the 2018 South Carolina gubernatorial election to a full term.
who was the governor of south carolina before the 2018 south carolina gubernatorial election
Henry McMaster held the position of Governor before the 2018 South Carolina gubernatorial election.
is henry mcmaster a democrat
Henry McMaster is a Republican.
who did henry mcmaster defeat in the 2018 south carolina gubernatorial election
Henry McMaster defeated James Smith in the general election, thereby winning election to a full term.

Question: how much did mcmaster win by
Self-contained rewrite: how much did henry mcmaster win the 2018 south carolina gubernatorial election by