Why Brutus' speech failed

Brutus' speech ultimately failed because Mark Antony easily convinced the crowd to side with himself.  The crowd thought that Brutus just wants a lot of power and does not care about Rome just like what Brutus said about Caesar.  In Antony's speech he convinces tho crowd to beliveve that murdering Caesar was unjust. Then he reads the will and everyone is in it so the crowd easiely sides with him.