30 year-old Jair Nilton Cardoso has been known to agents since the Obama family's time living in the White House.

According to NY Daily News: 

[He] showed up on the fourth floor of the building on April 10, held up a sign in an office window and loudly begged for her hand in marriage, sources said.

Hopefully this time he'll get the message and will stop bothering the former First Daughter.