A political speech that is a great piece of rhetoric and that inspires others is an example of a declamation.
When you deliver a political speech intended to rally supporters and intimidate opponents, this is an example of declamation.
Origin of declamation
- Middle English declamacioun from Latin dēclāmātiō dēclāmātiōn- from dēclāmātus past participle of dēclāmāre to declaim declaim
From American Heritage Dictionary of the English Language, 5th Edition