Widget get response

class GetResponse_Widget extends WP_Widget {

	public function __construct() {

		parent::__construct(
			'gr_wdg_newsletter',
			__( 'Get Response Newsletter', 'segfor' ),
			array(
				'description' => __( 'Mostra la newsletter per Get Form', 'segfor' ),
				'classname'   => 'gr_wdg_newsletter',
			)
		);

	}

	public function widget( $args, $instance ) {

		echo 'suka';

	}

	public function form( $instance ) {

		// Set default values
		$instance = wp_parse_args( (array) $instance, array( 
			'gr_wdg_gr_wdg_campaign' => '',
		) );

		// Retrieve an existing value from the database
		$gr_wdg_gr_wdg_campaign = !empty( $instance['gr_wdg_gr_wdg_campaign'] ) ? $instance['gr_wdg_gr_wdg_campaign'] : '';

		// Form fields
		echo '<p>';
		echo '	<label for="' . $this->get_field_id( 'gr_wdg_gr_wdg_campaign' ) . '" class="gr_wdg_gr_wdg_campaign_label">' . __( 'Seleziona Campagna', 'segfor' ) . '</label>';
		echo '	<select id="' . $this->get_field_id( 'gr_wdg_gr_wdg_campaign' ) . '" name="' . $this->get_field_name( 'gr_wdg_gr_wdg_campaign' ) . '" class="widefat">';
		echo '		<option value="value1" ' . selected( $gr_wdg_gr_wdg_campaign, 'value1', false ) . '> ' . __( 'Value1', 'segfor' ) . '</option>';
		echo '		<option value="value2" ' . selected( $gr_wdg_gr_wdg_campaign, 'value2', false ) . '> ' . __( 'Value2', 'segfor' ) . '</option>';
		echo '	</select>';
		echo '</p>';

	}

	public function update( $new_instance, $old_instance ) {

		$instance = $old_instance;

		$instance['gr_wdg_gr_wdg_campaign'] = !empty( $new_instance['gr_wdg_gr_wdg_campaign'] ) ? strip_tags( $new_instance['gr_wdg_gr_wdg_campaign'] ) : '';

		return $instance;

	}

}

function gr_wdg_register_widgets() {
	register_widget( 'GetResponse_Widget' );
}
add_action( 'widgets_init', 'gr_wdg_register_widgets' );