This one of those districts where Republicans REALLY knew what they were doing when they drew the lines. The portion of Franklin county is heavily Dem, but that is completely drowned out by heavily Republican and inelastic rural and suburban areas. It's similar to NC-10, where Republicans took heavily Democratic Asheville and attached it to heavily Republican Charlotte exurb counties to create a district where Republicans are guaranteed about 57% in all situations.
What are you talking about? The district was drawn in such a way that the traditionally Republican parts of Franklin County were placed in Tiberi's district, largely because the Columbus vote sink was drawn in such a way to encompass the truly Democratic parts of Franklin County...
Dublin, Worthington, Westerville and New Albany are many things but they're not heavily Democratic. Similarly, Newark and Mansfield are not "heavily Republican"...
