Levi Johnston, 19, the father Bristol Palin's son, has turned by the heat in his war of words with form GOP vice presidential nominee Sarah Palin, saying the he will file suit for joint custody of the child. "I don't know why they just don't want me in his life," Levi tells Entertainment Tonight. "[Sarah] ain't nothing," he says. "Just because she ran for vice president and was the governor of Alaska, doesn't intimidate me.When there's a kid involved you ain't walking away." (Photo: WENN)