I would strive to raise the GPA above a 3.5. I think you would be okay at that point. Also, as I'm sure most would agree - the MCAT will be a huge part of your app as with all applicants. I'd imagine a 3.5 SMP (regardless of the transcript having a C) and a really good MCAT would open some doors. A 3.5 and a lower MCAT, probably close a few doors.
I'm not an adcom though, so, grain of salt!
Best of Luck!