I missed the Democratic Debate on September 26th. So, I decided to catch up on it on the NY Times website. They have really done a great job.
The visuals are accompanied by a transcript on the right hand side. The visuals and the transcript are synced together – moving the video along automatically adjusts the transcript to the correct spot. Selecting a spot on the transcript moves the video to the right place. Broad sections are also provided so you can jump to them directly.