Well, you have to consider exactly what the "blues" are. If you mean someone that only plays blues, you're pretty limited. However, there are tons of contemporary and well-known musicians (like Flippy stated, i.e. Clapton) that have a large blues base. Hendrix did an entire blues album (not sure of name), Elvis technically introduced blues to the Caucasian persuasion, Van Morrison has some deep blues tracks, heck, even Hank Williams Sr. has some bluesy tracks. There are a good bit if you wanted to dig.
One major influence in traditional blues not yet mentioned, and one of the most recent I've been jamming to is Howlin' Wolf.