CREATE TABLE table_66197 ("Constituency number" TEXT, "Name" TEXT, "Reserved for  (  SC / ST /None ) " TEXT, "District" TEXT, "Number of electorates  ( 2009 ) " FLOAT)

Churai has what as the fewest number of electorates?
SELECT MIN("Number of electorates (2009)") FROM table_66197 WHERE "Name" = 'churai'
SELECT MIN("Number of electorates (2009)") FROM "table_66197" WHERE "Name" = 'churai'