Possible Clues:

• Horse-breaker, so to speak, delays proceedings
• Use long speeches to deliberately delay legislation
• Just by talking, one may break-in a young mare, it seems
• Use long speeches to delay or obstruct legislation
• Mercenary horse-breaker, reportedly
• Block the passage, so to speak
• Report of horse-breaker's delaying tactics
• Waste time by making long speeches
• Obstruct report of horse-breaker
• Speak at length to obstruct parliamentary proceedings