I haven't a full answer for you, but here's how I'd suggest you start it:
There's clear evidence of your theme in the lines "When the poor have cried, Caesar hath wept."
Reason being: Brutus only told (verbally) the people that Caesar was ambitious, giving no examples that are actual proof of how the great Julius Caesar acted. However, Mark Antony states right off the bat of what Caesar had done in his life-time. Antony decidedly debunks Brutus of any honourable traits as he continues with his Eulogy, as the more Antony says Brutus is "honourable," the more it is hypocritically placed. (What I'm trying to say here is the more Antony says Brutus is honourable, it actually counter-intuitive, Antony is trying to take away any honour the horrible man had.)