According to Politicomo.com:
"McCaskill is against the closings, stressing the importance of mail service for rural communities, but had another idea that caught the idea of The Daily Show with Jon Stewart, a political satire program on Comedy Central.
McCaskill suggested a marketing campaign stressing the “value of the written letter.”
“I had an opportunity to go through a box of letters that my mother had from my grandmother’s house that were my letters I sent to her in college,” McCaskill said. “My kids are in college now — I don’t have a box like that.”
Stewart — poking fun at McCaskill for calling out her daughters for texting her asking for money — called the act “jedi-knight mother guilting.”
“Claire McCaskill just entered the fact that her children don’t write her enough into the Congressional Record,” he joked."