Well you are certainly living up to your nick Ziem :)
You certainly do not live in Poland and don't "feel" the reality here, so I am happy to forgive you calling me Ziemodimwit :-).
If you asked one hundred people in whatever street of whatever town in Poland who Robert Biedroń was, you would possibly get 98 positive replies as to who he is. And this will be not because he runs for presidency in the coming election, but because he was the first openly gay mayor of a town in Poland.
But then, if you asked the very same people who Różański or Witkowski was, you would probably end up with one or two positive replies to that question at the maximum.
Witkowski is a such an insignificant candidate for presidency that I didn't even bother to open the Wiki link which Lenka provided.
As for Różański, the name only associates in my mind with some opressor of the Stalinist era, but I doubt it was him whom Delph had in mind. If so, I think that's too far away in time to be relevant for the current presidential election in Poland. Anyway, most people in Poland would not identify such a name in either case.
If you don't have this basic information
Thus, the above presumption of yours is highly inaccurate in reference to the word 'basic'.