Juncker:
if there is a Commission President who would not exploit the rights guaranteed to him by the [Lisbon] Treaty in full, and in parallel, an elected Council President who is trying to extend his rights at the expense of the Commission President
I think this would be the case if Blair was elected. In fact, I am afraid there would be little leadership conflict: Barroso would become Blair's poodle. "Dieu se rit des hommes qui se plaignent des conséquences alors qu'ils en chérissent les causes" Jacques-Bénigne Bossuet
One could also imagine that the European Council might choose a yes-man as High Representative to leave the field clear for Big Blair.
All of which supposes that the small countries will line up in European Council to submit to the big countries' power rip-off. Will they, won't they..?