What kind of birthday present do you get the U.S. senator who has everything? It's a tough one, isn't it?

But Bob Corker's campaign has a helpful idea for anyone who's stumped.

A recent campaign fundraising mailer invited Corker supporters to fill in an enclosed birthday card for the second-term Republican and throw in a check for up to $2,500.

Corker turns 62 on Aug. 24, so the card suggested gifts of $62 or $124 - "Just $2 for each year!"

"As you know, modern political campaigns are very expensive," Corker's wife, Elizabeth, explained in a letter accompanying the card, which a recipient passed along to The Tennessean. "So each year during this time, we ask Bob's supporters to continue their financial support for his campaign."

Corker doesn't face re-election until November 2018, which gives him four more birthdays to hit up his friends for bigger gifts.