By Tzvi Machlin For Ohio State fans, hatred of arch-rival Michigan runs deep. But over the weekend, that rivalry hilariously extended into the newborn care ward of an Ohio hospital. This morning Ohio State alum Amber Holley revealed that one of her coworkers at the ER recently had a baby. That friend took a picture of the baby’s new onesie and the message is extremely funny: “I just got here and I already hate Michigan,” the onesie says in big red letters. The baby is wearing a big red Ohio State cap on its head. The post is quickly going viral with hundreds of likes, comments and shares on Tw…