Postcard?
Yep. Post Card Campaign for Trump. Sending today and just about every Monday till the Convention (twitterverse and internet).
Speaker of the House
Paul Ryan
1233 Longworth, HOB
Washington, D.C. 20515
No Trump, No Vote! (or a message to your particular liking)
To be clear, the postcard campaign was not started by Trump. It was started by a Trump supporter who is using Trump's photo as a symbol of solidarity.
Postcard Campaign - Part 2
(Not initiated by Trump.)