I've seen Corbyn a couple of times on Marr, and I think the bloke speaks very well (he never dodged a single question in either interview, and not one evasive politicians answer), and I reckon he could sway a decent amount of voters who are sick to death of seeing trained circus monkeys turn up on telly and spout the same nonsense time and again. The way he speaks, I could see a lot of the younger generation voting for him, as he doesn't do the normal evasive nonsense and appears quite calm - no one has seen him fight for a General Election as party leader though, so God only knows how he'd handle that. I could imagine him standing his own quite well in a debate against other party leaders though.
His main problem, and one that just won't go away is the pure hatred from within the PLP. It'll be hard enough to battle the Tory press at an election, but he'll also be battling the Bliar camp. The recent nonsense about the Labour MP who had her office broken into, and the brick through the window are perfect examples of how the press are manipulated by that shower. It's all pretty shite.