https://www.forbes.com/sites/johncarpenter1/2016/11/30/post-election-america-looking-beyond-the-red-state-blue-state-divide/#73ed3c737a6a
Here is a place to start. From Forbes - a reputable news source using data from the Brookings Institute, not some right wing blog.  Also it was 64% not 70%, my memory failed me.