GHANA'S Vice President Mahamadu Bawumia said he was ready to lead the nation in a campaign launch speech, pledging to revive the battered economy, fight graft, and boost the private sector if elected president in December. The 60-year-old economist was overwhelmingly voted presidential candidate of the ruling New Patriotic Party (NPP) in November, teeing up a contest with former President John Mahama. The former central banker said he was ready to be "in the driver's seat" in a speech to crowds of supporters at the University of Professional Studies in Accra. "I want to build a Ghana where we leverage…