Champion/Challenger: Declare a Champion champion-challenger-declare-a-champion
When you’re ready, you can declare a champion for your email test.
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Go to Marketing Activities.
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Find and right-click your email test, then click Declare Champion.
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Select the Winner of your choice.
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Set the Declare Date.
note note NOTE Until the Declare Date, Marketo will continue to send the old champion and challenger(s). Once date/time is reached, only the new champion will be sent. 
note caution CAUTION Notice that the default Declare Date is tomorrow, not today. -
Select a time and click Save.
Rad! Now you know how to easily run an email test to improve your content without interruptions to your campaign.