Conversation so far:
What happened in the 2005 leadership election for David Cameron's party?
Following the Labour victory in the May 2005 general election, Michael Howard announced his resignation as leader of the Conservative Party and set a lengthy timetable for the leadership election.
Why did Michael Howard resign?
At the 2005 general election, Howard's Conservative Party suffered a third consecutive defeat. Howard stated in a speech that he would not lead the party into the next general election.
What else happened for David Cameron after Michael Howard resigned from leadership in 2005?
Cameron announced on 29 September 2005 that he would be a candidate.
Was David Cameron well liked for leadership electrion in 2005?
Parliamentary colleagues supporting him included Boris Johnson, Shadow Chancellor George Osborne, Shadow Defence Secretary and deputy leader of the party Michael Ancram, Oliver Letwin and former party leader William Hague.

Question: Who was Boris?
Self-contained rewrite: Who was Boris Johnson in the 2005 leadership election?