Student or Learner
What does "by" mean?
Reports of differences that have surfaced with increasing intensity in recent months had more to do with competing power bases and jockeying by proteges within the party than fundamental policy differences, he said.
'by' markes the subject/actor/doer of 'jockeying':Originally Posted by NewHope
by proteges => proteges jockeying within the party
All the best, :D