Michelle Obama mentions president's gray hairs

President Obama just can’t catch a break.

Instead of relaxing on his 50th birthday, he’s busy fundraising in Chicago. And now, rather than simply wishing him a "happy birthday," the First Lady is poking a little fun at her husband’s changing hair color – sheesh!

In an email signed by Michelle Obama asking for supporters to sign a birthday card for the president, the First Lady writes, “Every day, I see Barack make choices he knows will affect every American family. That’s no small task for anyone – and more proof that he’s earning every last one of those gray hairs.”