user: Question: Who is the candidate in Race for State Representative, HD18?
Columns: ['Race', 'Candidate', 'Party', 'Notes', 'Votes']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['U.S. Senate', 'Jeff Merkley', 'Cross-nominated Democratic', 'Defeated incumbent Gordon Smith', 864392.0]
SQL:

assistant: SELECT "Candidate" FROM "Table" WHERE "Race" = 'State Representative, HD18';