I don't think Powell would support him. Gut feeling.
This is VERY difficult to figure out
I wanna say Ben Carson with the older white folks feeling safe with him being so reserved and humble and with a low voice and not as vocal as President Obama. But Trump already kind of has it locked up with these older white folks, alot of times the key with vice presidents is to have someone that can appeal to a group of people you do not appeal as well with.
Like how Clinton had a "serious intellectual" for people who may have been clowning him for being too Hollywood and flashy while he was running. Obama picking Biden, someone with decades of experience in politics for those who said he was too inexperienced, and also to butter up the middle of the belt white folks who feared Obama would be like Malcolm X. To select someone they all know as if he is their grandfather(Biden).
Trump man...I can't think of someone