I for one think it is incredibly closed minded to say that certain groups/ethnicities/minorities/statuses/whatever people should be assumed to support one party or the other. I'm queer, I must vote dem and make every single candidate pick run solely on LGBT issues. I'm Jewish, gotta stay liberal. I like some GOO ideals, best hate everyone and vote for whatever makes Obama mad!
I'm NPA, I'm am completely independent, and I've voted for The donkey, the elephant, and other groups too. I tend to vote for candidates that will benefit me the most, with hurting others the least, and if I am not sure of an issue or don't beleieve in it or want to hinder it, I do the decent thing and simply don't vote on that issue instead of making a misinformed, no-thought vote.
Like... Why is this considered bad or hard to understand?
Because you have no idea who any of these candidates or how voting for them would affect anyone. The fact that you'd jump from Biden to Bernie to Trump to Carson shows your prime concern is with personality, not issues or policy, which is bad and textbook uninformed voting.
This also shouldn't be news to you -- plenty of people in this thread have pointed out how ridiculous your voting preferences are, and why, and you continue to ignore them so you play the "bu-bu-but why don't others understand!!" card.