In order to clone an existing campaign, simply click on the mark located to the left of the campaign name.

A list of options will appear. One of them is the option to clone the campaign.

By selecting to clone the campaign, a new campaign setup page will open, and you will be able to edit any of the existing setups. 

This is a good option if you want to create the same campaign for different Geos.

Please note that you can only clone a specific campaign and not a campaign group.