Whattt? No details please provide
#1) How are they similar to "the slaves of political parties"?
Answer: Slaves wanted to be trusted by their overseers because this often would grant them privileges that other slaves did not have.
#2) Why does Douglass make this comparison?
Answer: Slaves would seek with great care to please their overseers to gain their trust, just as office-seekers in the political parties seek to please and deceive the people.
I hope it helps, Regards.
Before meeting her, he was moody and gloomy, because he had been rejected by Rosalie. After meeting Juliet, he insists that he could find no greater love than she, and wants nothing more than to see her always. It can be inferred that based on his behavior, he doesn't know that love really is, and that he's extremely rash in his decisions.