A primary is a preliminary election used to determine a party's nominee for a specific office. The winner of the party's caucus, or primary, wins the party nomination for that state. Then the delegates meet at their party's national party convention, which is a formal gathering of all party delegates from all states.
Amendment V, also known as The Fifth Amendment was passed on by congress in the year 1789. It beholds (Is that the right word?) the law: No man shall have to be a witness against himself while in court. Well, this is MY summary of Amendment V. Hope it helps!