When using Display Ads, you can set Visitor Conditions to an ad. While Display ads can’t identify supporters vs. non-supporters, you can target new visitors or returning visitors using the condition, New Visitor.
To target a new visitor,
Navigate to Display Ads > Ads and select the ad you want to target or create a new ad.
In the ad edit screen, navigate to Targeting > Visitor Conditions.
Under Visitor Conditions, choose the condition, New Visitor. For New Visitors, set the condition to ‘Is'. For Returning Visitors, set the condition to ‘is not’.