It's a bit like I saw on TV the other day (can't remember who...)
But someone said that the Congress' approval rating was at 8%. The comedian said we should round up the 8% that think they're doing a good job and take away their voter registration card.
To go back to what you were saying, you seem to be saying that you "don't approve" and may or may not be one of those "upset about" not bringing hope and change like he promised, but you're still voting for him. So you can't be that upset.