public function mt_publishPost( $args ) {
		$this->escape( $args );

		$post_ID  = (int) $args[0];
		$username = $args[1];
		$password = $args[2];

		$user = $this->login( $username, $password );
		if ( ! $user ) {
			return $this->error;
		}

		/** This action is documented in wp-includes/class-wp-xmlrpc-server.php */
		do_action( 'xmlrpc_call', 'mt.publishPost' );

		$postdata = get_post( $post_ID, ARRAY_A );
		if ( ! $postdata ) {
			return new IXR_Error( 404, __( 'Invalid post ID.' ) );
		}

		if ( ! current_user_can( 'publish_posts' ) || ! current_user_can( 'edit_post', $post_ID ) ) {
			return new IXR_Error( 401, __( 'Sorry, you are not allowed to publish this post.' ) );
		}

		$postdata['post_status'] = 'publish';

		// retain old cats
		$cats                      = wp_get_post_categories( $post_ID );
		$postdata['post_category'] = $cats;
		$this->escape( $postdata );

		return wp_update_post( $postdata );
	}