Once you graduate, it's EXTREMELY difficult to land a position within the BIG 4 accounting firms. Hell, it's extremely difficult to land a position in a mid-sized firm as well.
The problem is that most firms will look at it negatively that you weren't able to land while a campus recruit. I was able to secure interviews with E&Y and PWC while in college for internships. Once I graduated, they wouldn't even speak to me, despite the fact I was able to still use campus recruiting. Unfortunately, as I've found: a lot of opportunity evaporates once you graduate from college. It's also very difficult to land with below a 3.6 GPA.
Your best bet is going to be to try networking. I spent over a year trying to get into a public firm (while working in private) and couldn't do it. Granted, I eventually managed to find an internship at a medium sized CPA firm for tax season (even that was really hard to do). Unfortunately, internships don't guarantee a job as I found out; I was told the firm wasn't hiring. Ended up stuck in private again, after the whole ordeal and gave up on public for a while.
Your best bet will probably be to try networking (how I landed the internship at the national firm). Even then, it's going to be a pretty tough task. If you don't mind doing tax work, I would focus on working at a smaller firm, then transitioning to a larger one. A few smaller firms I've seen, even do some audit work. I personally hate doing taxes, but I might just have to settle in order to gain my CPA experience.
B=84 This exam was such a b**** that I thought I failed-don't know how these things work
A=76 Slacker I am, I'll happily take it
R=81 I LOVE taxes
F=80 I don't wanna get banned for an expletive I'm thinking with "yea" proceeding it