While Tim Kawakami broke the news earlier, "Harrington no longer wants to play for Don Nelson", Marcus Thompson interviewed Al around midnight last night where Al basically says that he wants to be traded:

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So what is it about playing for Don Nelson that has you fed up?
"I went through it all last year. It all started in the playoffs the year before. It wore on me, you know what I’m saying. I didn’t want to play for him. I told him that this summer. I told Mully that. I reiterated that again to Mully. I’ve told him twice since training camp has started that I don’t want to be here. I don’t think me and coach is going to work out, regardless of who’s playing, who’s not playing or whatever, because I feel like he uses me in certain ways and I don’t think that’s going to change. We all know how Nellie is. We all know his history. If you’re not one of his dudes, you ain’t never going to be one of his dudes. And that’s the truth."

"Have I asked them to trade me? Yes I have. Plenty of times. All summer. Once a month. It never happened. I’m still here. Do I know what my future is? I don’t know. First game is tomorrow. We’re going to see what happens. But at the end of the day, if it’s like last year, then I can’t be here. And that’s for damn sure."
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From Janny Hu: Al Harrington: "I've been wanting to be traded since the end of last season"

Another article from Kawakami: Harrington officially asks to be traded from the Warriors: Now what happens?