I agree with tr_th--you need to pick what you are passionate about first (it is a 4-6yr commitment) before you pick the school.
teachgirl22, I think you have good chances with your experience. However, make sure that you at least break 600 for V/Q for GREs. I know from insiders that 600 (or minimum 60% percentile) is the cutoff for most students unless you have an amazing resume.
hitomimay--I was a former TFAer myself and I will say that being in TFA for two years is not a qualifier or pass to good programs/good jobs--most two years get into HGSE's M.A. program but very few get into the PhD. You should look at their stats and average years of experience--that will help you figure out if you are a qualified applicant. My personal opinion is the fact that you still list summer school experience shows me you have no business being in a ed leadership/policy PhD program, especially with such a low undergrad GPA, no publications, and no relevant research experience. You might have better luck in a science ed PhD program. Some suggestions are to take on more leadership roles (i.e. member of instructional leadership team, department chair, program development, VP, Principal, school founder, etc) and also get more "relevant" research experience. Undergrad bio research has very little to do with ed policy unless you want to study how to improve science education.