What does Caissius mean by the quote "This tongue had not offended so today, if Cassius might have ruled"?

Cassius wanted to add Antony to the killing in the Senate the day the senators targeted Caesar.  Brutus disagreed saying that they did not want to seem blood-thirsty, but acting on principles of love for Rome and the nobility of the country.

Cassius' quote, then, simply translated would be:  Antony's speech would not have effected the crowd and offended us so much if you had listened to me and Antony was silenced/killed at the same time Caesar was."