Q and 'Bino in the house and you niggas in the senate
Get it?

from Childish Gambino (Ft. Ab-Soul & ScHoolboy Q) – Unnecessary Lyrics on Rap Genius

Meaning

Good play on words! He’s referring to the House of Representatives (frequently referred to as “the House”) and the Senate; both of which are the houses of the United States Congress. But it’s more likely that he’s claiming to be in the White House, like the president.

Also being “in the house” is a common phrase in hip-hop used to describe the state of being present.

This may also reference a similar joke Gambino used in “Hero”

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