Conversation so far:
What did Benn do in 1997?
Benn was initially somewhat sympathetic to Blair, welcoming a change of government.
What change of government?
Blair] set up a new political party, New Labour".
Why did he set up a new party?
CANNOTANSWER.

Question: What else did Benn do in 1997?
Self-contained rewrite: What else did Benn do in 1997 in addition to supporting Blair and his change of government?