I agree with what's stated above--it's an uphill battle without a PhD. I have my MFA and publish regularly, including a book last summer. I have yet to get an interview for a full-time position, including community colleges and junior colleges.
That said, experience does count for something. I've been teaching at my current university for over 7 years, and while I can't get full-time work through them, I've been able to put together part-time positions in two different departments and together that gets me close to a full-time position (and most importantly, I get medical benefits).
There are a couple ways to increase your chances of scoring work with an MFA.
1. Adjunct like crazy, make connections in the departments, and make yourself as indispensable as possible.
2. Focus your classes on something in high demand but also unusual. My writing and research seminars focus on science fiction, robotics, and space exploration. These aren't typical offerings, so the classes fill up fast and students are very enthusiastic about them, which helps a lot. I'm not sure how many other instructors could fill those voids at this point.
3. Make yourself available to fill last minute vacancies (August is a good time to check for these), summer classes, ESL classes, etc. Name all of the courses/subjects you're willing to teach and see if something sticks.
4. Charters and private high schools don't always require teaching certificates and can be a great way to find consistent work (I taught English at a charter school for five years).
5. Check out adult ed, teaching English as a second language, and other non-traditional learning institutions.
6. Offer tutoring for various ages and in various subjects (ie, college essays/applications, musical lessons, etc) whether on your own or through companies such as Kaplan.
7. Publish! The more work you get out there, especially book-length work, the better your chances.