I'm not surprised with both experiences. I've actually known Johnny since 1981 when I moved to Atlanta and went to school with one of his sons. He is a good man, and a decent public servant. I've sent emails to his office before and always gotten responses.
I've also reached out to Sen Perdue's on multiple occasions and never gotten anything but form responses. Can't wait to vote against him next year he is nothing but a low class person who chooses not to you the brain god gifted him. Can't stand him.
I could care less what school you attended - I care about how you interact with people.
Isakson seems to care about people, Perdue seems to care about himself.