I am 46, and have never seen a brokered convention. Would love to see how they barter the delegates on the convention floor. I know that if no candidate has more than 50% of the delegates then it is brokered. Therefore a two man race can't be brokered because one will have the extra delegate. If there were three candidates still in at the convention with no-one having over 50% of the delegates. Two candidates get together and pool their delegates to beat the third candidate. Now that is what conventions are all about. The Democrats shouldn't have a convention this year because ‘The One’ is running unopposed.
You are probably too young to remember the 1976 GOP convention. It came very close to being brokered because there was a three-way race between Ford, Reagan and Uncommitted. That one was very exciting.
I was 12 when I watched the 1968 Democrat convention on my grandmother's grainy old black and white TV. That one got me hooked on politics at a very young age with excitement on the floor and out in the streets.
I'm not sure exactly when it was that political conventions deteriorated into nothing more than media events with the talking heads deciding what was and was not worth covering. I think it happened sometime during the years I lived in Japan (1988-2002).