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

from Childish Gambino (Ft. Ab-Soul & Schoolboy Q) – Unnecessary Lyrics 8 on Rap Genius

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.

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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