I don't know if it's harder but when you're playing a real person you want to honor their memory - even if they're a criminal or someone that the public loathed. That can be challenging.
“In morals what begins in fear usually ends in wickedness; in religion what begins in fear usually ends in fanaticism. Fear, either as a principle or a motive, is the beginning of all evil.”
“Liberty is to the collective body, what health is to every individual body. Without health no pleasure can be tasted by man; without liberty, no happiness can be enjoyed by society.”