I think that is too much cardio. I mean, you didn't say what kind and how much, but twice a day, 7 days a week sounds like too much. You will probably end up burning some muscle keeping that up.
Tom Venuto (in BFFM) does say that sometimes adding in 2 cardio sessions per day (temporarily) can help jump start you if your weight loss is stalled, but I don't think he meant 2 cardios + lifting in one day. Not to mention, you will probably get burned out quickly on a schedule like that.
Keep an eye on your body fat percentage (and conversely your Lean Body Mass) and make sure you are not loosing muscle. A good rule of thumb is 1-2 lbs per week means its mostly fat.
But then again, I am a "less is more" kind of person when it comes to cardio. I can loose at the 1-2 lb per week rate by doing cardio 3x/week. I might be stepping that up a bit for the contest (4-5 times per week), but it will be a mix of traditional cardio and guerilla cardio - because I work too hard for these muscles to loose any.