I managed to have Kenny, Ben, Omid and Krista with me in the end. I was shocked about Kenny... We've had a rocky go of it, ever since he dropped the salt lick on Larry's head. But somehow, I managed to get him to come with me -- he even mentioned that he didn't know if I would put my life on the line for him. Not sure what affected his decision -- I told him that Clem was my family, and that seemed to win him over I guess. I think things are only going to get worse in Episode 5, since he seemed pretty pissed when I insisted Ben come with us.
Edit: Oh, and Molly is awesome. The scene where she fends off the zombies in the school was amazing. I only wish she'd come with me.