I dunno, I think this question is a little dumb. Who cares about state senators? I know who my US senators are, but state senators? I've moved around a lot in the last few years, so I haven't been that involved in local government, but I put a lot of effort into current events because I'm genuinely interested...and I wouldn't have known how to answer that.
ok...looks like everyone is referring to US senators - anyways, just sayin, theres a big difference
THANK YOU THANK YOU. I was praying
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🙂 that someone would stop and point out the difference because I was really losing faith in humanity as the two were being egregiously spoken of as synonyms...
Quit fussing, you're fine.
Unless you're a political science major. 
I rarely ask trivia, but the interviewer seems like he wanted to throw you a curveball...or maybe a spitball.
So only poli sci majors should know the names of local politicians?

Regardless, that's a gross generalization of what the discipline is about (poli sci major here).
Also, the names of the current US Senators of 2013 in the home state of an applicant is not trivia. (Trivia, by definition, are details or pieces of information of little importance or value.)
WOOT INFORMED PHYSICIANS!!11!!!11!!11!! (not) And the profession is scandalized when lawmakers tend to not factor in its "voice" whilst making policy decisions? Hm, I wonder why........
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Okay, I get it. Americans are not, and will never be, as involved or interested in politics as our European or Asian counterparts are for a variety of historical, social, and political (no pun intended) reasons. Doctors are busy and they could care less for the circus that is the political sphere. Fine, that's all fine.
But it's deeply concerning that there is such a backlash against the asking of this question as "stupid" or "pointless" during an interview. It's not like the interviewer asked if Senator X voted yay on HR 341 last week or something. That borders on being trivia. He/she asked the
names of the two Senators. That's four words in total. It's a perfect question to attempt to gauge how informed the applicant is about the world he/she lives in. If we accept the idea that med schools are looking to build a diverse class, this question is not blasphemous as people ITT think.
There's been a lot discussion in the "opinion" sections of NEJM, JAMA, Annals, Health Affairs, etc., regarding pervasive and detrimental culture problems within the medical field. The quip made by Goro epitomizes this worrying reality. When providers are so boxed up into their profession so as to leave little to no time left for engagement, even at the most primitive level, that of observation (i.e., reading), in other fields, it is not a surprise that certain areas in medicine remain archaic, frustrating, and inefficient because they remain completely opaque to advances and improvements that could be adapted into the profession. If we want this to change, small things, such as knowing the names of two of the most powerful lawmakers from your state, is a good place to start.
That being said, though, if a med school found this enough to reject an applicant, I can see how this would be one reason, but there must be other more compelling reasons to go along to put the app in the trash stack. Otherwise, OP should be fine.
TL;DR: Don't make any effort to know anything about politics, whether national or state or local, if you don't care to. That's fine. But stop this "I'm going to med school, don't need to know anything except MCAT, basic sciences, and how to talk to people, so how dare you ask me such a question during an interview where you're calling the shots" facade. It doesn't do any good for anyone.