CREATE TABLE table_66539 ("Constituency number" TEXT, "Name" TEXT, "Reserved for  (  SC / ST /None ) " TEXT, "District" TEXT, "Number of electorates  ( 2009 ) " FLOAT)

What district has an assembly segment named mahidpur?
SELECT "District" FROM table_66539 WHERE "Name" = 'mahidpur'
SELECT "District" FROM "table_66539" WHERE "Name" = 'mahidpur'