If Julian Assange runs for the Australian Senate and is elected, he will be arrested as soon as he sets foot on his native soil. Assange likely has some kind of secret arrest warrant out for him from the United States. If the WikiLeaks founder goes home, he'll be a sitting duck for countries to come after him.
No, Julian Assange should not run for Australian Senate, because he does not have a wide backing. It is hard to know if Julian Assange is a fighter for freedom and a defender of free speech, or if he wants to destroy capitalist countries. Without knowing what his goals are, he would not be a good choice for public office.