Are poor people equally represented?
Of course not. Poor people cannot afford the cost of buying a congressmen let alone a senator, even on the state level.
Whether you are rich or poor, whether you vote or not, as a legal citizen you are represented, if not equally, in the halls of power. If you don't vote you just let others decide who that representative will be and if you're poor you pay less for that representation than an international corporation which may have many legislators, congressmen and senators on their payroll.
Illegals have no such representation officially. If you're a Democrat you kinda feel obligated to represent all in your district, even illegals, as a matter of public good. If you're a Republican then you will actively campaign against the public good when doing so favors your major donors.
As far as illegals go ... by paying (unrepresented for sure) sales and school and property taxes you likewise get the use of the public benefits like roads, schools, fire, police, emergency services and like that. In this way illegals are indeed paying a share of the public services they use.
And just by being here, legal or not, you are supposed to be subject to the benefits and restrictions of the US Constitution though the Trumpettes seem the think otherwise.
Eschew obfuscation. Habituate elucidation.