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_28946 ( "District" text, "Incumbent" text, "Party" text, "First elected" real, "Result" text, "Candidates" text )

### Question ###
How many times were the candidates leven powell (f) 63.8% roger west (dr) 36.4%?

### Accurate SQL ###

SELECT COUNT("First elected") FROM table_28946 WHERE "Candidates" = 'Leven Powell (F) 63.8% Roger West (DR) 36.4%'