I wouldn't worry about it affecting your chances. Just check out the jobs in the public sector you'd be interested in, and see if you'd actually be better off having an MPA. I doubt it would hurt you, but you might find that only having an MBA would be enough.
Also, definitely do your research when it comes to the quality of the school - especially for MBA programs. Like Duncan said, you may be better off doing an accredited MBA first and then an MPA afterward if you still feel you need it. I'd worry that in selecting schools that only offer the dual degree, you might be selling yourself short in terms of a quality education.
As far as schools go, some of the top schools (Stanford, MIT Sloan) have partnerships with the Harvard Kennedy School to offer an MBA/MPA dual degree in three years, usually. If that's too Ivy for you, Presidio in San Francisco has a decent dual degree program, but it focuses on sustainable management.
I wouldn't worry about it affecting your chances. Just check out the jobs in the public sector you'd be interested in, and see if you'd actually be better off having an MPA. I doubt it would hurt you, but you might find that only having an MBA would be enough.
Also, definitely do your research when it comes to the quality of the school - especially for MBA programs. Like Duncan said, you may be better off doing an accredited MBA first and then an MPA afterward if you still feel you need it. I'd worry that in selecting schools that only offer the dual degree, you might be selling yourself short in terms of a quality education.
As far as schools go, some of the top schools (Stanford, MIT Sloan) have partnerships with the Harvard Kennedy School to offer an MBA/MPA dual degree in three years, usually. If that's too Ivy for you, Presidio in San Francisco has a decent dual degree program, but it focuses on sustainable management.