An attempt has to be made to portray him in that way, but the flipside to that is that he's a loony lefty career politician from ("liberal heartland") Islington who's never had a real job, hates the Queen and the armed forces, loves immigrants, and wants benefit scroungers to be given more money. Shifting the debate, and Corbyn's portrayal away from that is the big challenge of the next twelve months, and might prove to be impossible.
He's an intelligent man who lives in Islington that actually wants to protect the underprivileged and people who can't do so themselves (there are still plenty of that type of persons in Islington). It wouldn't be fair to compare the integrity of a man like that to a man like David Cameron, and there will be no attempt to do so for obvious reasons. The major obstacle is the mainstream press and ensuring the principles of his message reaches the people of the country.