Campaigns not showing in associated leads details

Campaigns not showing in associated leads details

I would like to select the leads that are associated to a particular campaign, other than in the campaign page, which doesn't let me to do mass updates or mass emails, export, etc, but only access one at the time.  I notice the  campaign field within the lead is empty, despite the fact that the leads is listed in the campaign page, so I need to enter this field on each lead manually, one by one, which seems redundant. There must be a better way... 

Thanks in advance


Gloria