    def validate_schema(cls, tx):
        """Validate the election transaction. Since `ELECTION` extends `CREATE` transaction, all the validations for
        `CREATE` transaction should be inherited
        """
        _validate_schema(TX_SCHEMA_COMMON, tx)
        _validate_schema(TX_SCHEMA_CREATE, tx)
        if cls.TX_SCHEMA_CUSTOM:
            _validate_schema(cls.TX_SCHEMA_CUSTOM, tx)
Validate the election transaction. Since `ELECTION` extends `CREATE` transaction, all the validations for
`CREATE` transaction should be inherited
bigchaindb/elections/election.py