How? Just by watching my TV. Oh, and an Israeli newspaper.
Vindman, Goldman, Yavonovitch, the Vindman golddust twins, Nadler, Schiff, Cicilline, Raskin. Key witnesses Noah Feldman of Harvard, Pamela Karlan of Stanford and Michael Gerhardt UNC. Gordon Sondland. etc etc...that’s just off the top of my head. Not a bad showing for 2.4% of the US population.
https://www.timesofisrael.com/the-jewish-players-in-the-trump-impeachment-hearings/
How many “witnesses, accusers, state department people, the Democrat prosecutor lawyers, and the congressfools” were involved in the impeachment? Then we can get a percentage.