Diane Abbott Vs Alastair Campbell on the BBC's This Week.
I didn't see this myself but saw it highlighted on Andrew Gilligan's blog. I suspect the tension between them isn't just ideological (Diane probably gets on well with lots of people who supported the Iraq war) - it's just that Diane and Alastair don't like each other as people.
Although Abbott and Portillo challenge Campbell about him bullying journalists, judging by Oona King's autobiography (House Music) - and no doubt lots of other evidence - it was Labour MPs who were most at Campbell's mercy. I don't know if the press manager in the movie In the Loop is based on Campbell. If it is, he must have been impressively horrible!