I don't know why I keep making this same point over and over when no one will listen, but I do. If you say all the Dem voters vote Dem because they're lazy bums that just want gov't money and if the Dem voters are more widely represented amongst minority groups then you're saying that minority groups are lazy bums that just want gov't money. People in the GOP having that attitude is part of the reason why the minority groups don't like the GOP.
Consider Asian-Americans. They are the stereotypical hard workers that aren't on the dole, right? Well in 2008 62% of them voted for Obama. And then after four years of Obama, in 2012 73% of them voted for him again. Why? If don't want to hear it from me then google "why do asian americans vote Democrat" or something like that. Here is Politico's take but I'm sure you can find others.
http://www.politico.com/magazine/story/2014/03/asian-americans-democrats-104763.html#.Vd-7j5erH-s