Depends on how those votes are distributed, in both directions, but I doubt either would make a huge difference. One thing to remember is that rural areas are less red than cities are blue. A 75/35 split seems to be the most common rural distribution, whereas many city districts are 90% dem with the GOP struggling to outperform the greens or libertarians.

The GOP stands to gain nothing in the urban cores outside of a few southern cities and Texan cities, but they currently live for the suburban fight. The Dems biggest struggle out in the sticks is less that they can't field any candidate that isn't an 80 year old union man or a local youngin' fresh out of college who says all the wrong things (and is thus unelectable).