I have been a CNA before, but I had to be recertified because I moved to a different state. My class won't end until mid April, but my instructor informed me that the assisted living place I very much wanted to work for would hire before you graduate. So, I went and filled out an app yesterday, and she called me and asked me to come in on Monday morning. I'm pretty sure I have the job.
There are some that will hire before you graduate obviously, and I think it's a great way to go ahead and get your foot in the door. Of course, just starting out you may tend to be a bit more nervous and unsure of yourself, but most places let you train with someone before you go out on your own to care for residents.