Access argument string for all administrators to access menu
Defining your module in hook_menu is not enough. You need to define hook_permission() too. You can do something like this

function raffle_permission() {
   return array(
    'administer site configuration' =&gt; array(
      'title' =&gt; t('Administer Site Configuration'),
      'description' =&gt; t('Perform administration tasks for my module.'),
    ),
  );
}