My Horse is Amazing

Let's hear it for the unsung heroes of a generation.  The men and women who have lifted us up upon their backs and shoulders, the gravity that's kept us grounded, and shielded us from the horrors, terrors, and nightmares that we'd constantly be facing without their courage and honor.
Who else could I possibly be talking about but the 2nd person in a 2 person horse costume.  Not only does fronty get all the credit when the horse is unmasked, but you're in the back, bent over all night, literally being the butt of all the jokes made about you, in a hot smelly horse half.  People who we generally detest are often referred to as "a horse's ass", and yet here you are.  They tell us not to look a gift horse in the mouth, but I say let's not look at a horse back half at all.  Also, I have no idea what a gift horse is, and why we can't look it in the mouth.