Say you are an unexperienced politician with the audacity to run for president after a mere 3.5 years of national experience.
Say that as part of your campaign strategy you spend of 5 or 6 months straight ignoring all the successes of the only Democratic president to be elected in 28 years.
You also spend a lot of time calling him a racist.
And you spend the rest of your time spurring your misogynistic sycophants towards his wife and your fiercest competition.
How then could you ask the same former president to be your Unity Pony?
What do you think the former president would do, after spitting out his coffee through his nose while laughing at the request?