Which of these is an important element in establishing an effective argument?

identifying with the opposing side
challenging the opposing side(right?
ignoring the opposing side
celebrating the opposing side

The correct answers are Identifying with the opposite side and

Challenging the opposite side.

To argue is to defend rationally an idea or opinion in order to lead an interlocutor to accept as valid that idea or opinion. The effectiveness of argumentation depends on the consistency and persuasive force of the argument

obama was told in early july 2004 that he was chosen to deliver the address, and he largely wrote the speech himself, with later edits from the kerry presidential campaign.