Well as a die hard Laker fan I beg to differ :-) but you are right since most of the fan base is black, I used to go to Laker games a few years back, it was mixed, but yes mostly black, some Latino and white but mostly black
There was an actual survey done about this with plot points, etc. inside a circle graph. The football fans were the most conservative, but tennis and basketball were significantly on the liberal side. Baseball was about in the middle but slightly liberal.
You probably have more anecdotal knowledge than me, however. I never warmed up to the Lakers while living in SoCAl.