A cake for me why

Date: 8/25/2016

I'm in some neighborhood and there's a dog that belongs to a guy in n a house across the street. I put a leash on the dog and offer to walk her. The guy gives me a cake and tells me it's only partly decorated and that I must keep it until March and finish decorating it to say "congratulations, Hillary." I spend some time trying to figure out what I'm being congratulated for.