I was admitted to my program "conditionally" and received both financial aid AND a TA. However that being said I had to work extremely hard to get the TA...I pretty much made it my top priority (i.e. I met with the chair of the graduate committee and the department, the lab coordinator at our school and convinced them that I deserved funding) My grades sucked but the rest of my record was solid so if you're in the same boat then it is totally doable it just may take a little more work