I think I am right in saying that you would have to declare this to the FAA and a second conviction would/could result in enforcment action as they then consider you to be a risk. However I have flown with people who had drink drive convictions within the airline industry so on its own I doubt it will prevent you getting a job. I think though that you will find that given a similar level of experience to other applicants you would be less likely to be called for an interview than someone without a drink drive conviction. You may welll find that in the medium term you have made life vey difficult for yourself, there is no excuse for being drunk in charge of a motor vehicle.