Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2668393_18 ( candidates VARCHAR, incumbent VARCHAR )

### Question ###
How many times was the incumbent john dawson redistricted from the 15th district?

### Accurate SQL ###

SELECT COUNT(candidates) FROM table_2668393_18 WHERE incumbent = "John Dawson Redistricted from the 15th district"