I've noticed mixed feelings from black commentators (whom tend to carry a quite readable racial bias) regarding the likes on Manziel and Tebow (i.e. the white running quarterbacks). While certainly they are generally uninterested in rooting for a white player, they seem a bit ambivalent about these two. The reason is the following: They sense the job description of quarterback "evolving" into something that more closely fits what they see as a "black skill set." So in other words, there is some instinct on their part to root for a Manziel as he seems in a way to be "blackening" the position.
One was likely to encounter a similar phenomena among black music aficionados when Elvis was emerging. Yes, blacks disliked what they viewed as yet another glorification of the white man, yet they sensed some value in something that further "blackened" the culture. Certainly, no doubt, they also viewed him as an inferior version of the "real deal." Hence, Eminem and Whiggerism (i.e. the entirely blackened and degraded white man or the white man as merely poser .i.e. inferior black man) they're more or less cool with. Of course, nothing will completely end their simmering resentment of whites no matter how "down" or debased whites become (as if appeasing blacks is more important than not being debased!).
Returning to football: Nevertheless blacks are more or less forced to give props to the dominant classic pocket quarterback like Manning or Brady. And, in all honesty, they must sense their particular skill set as a white specialty or "magic" that one of their numbers is unlikely to replicate. Certainly it is better, in their view, that a consensus be reached that the running quarterback is the future. And they are quite comfortable with the idea that such a change would come about for no other reason than the running quarterback is more "dynamic" and entertaining, even if he is typically, in real terms, less potent as a player capable of leading his team to victory. The notion of the running quarterback represents a decline in the nature of the quarterback position and a weakening of the order and team aspect of the sport. It is not dissimilar to the decline of the jump shot and team play in basketball.
This is a nuance that adds a wrinkle to the commentary of black sportscasters regarding Manziel et al.
Having said all this: It is entertaining as hell having a white player beat them on their own terms in their own style.