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I see him as more of a business republican in the old school mode. He would do this for business reasons and doesn't strike me as one of those southern senators who wallow in ideology.
The others, while doing this for their states and seeing them as more important the good of the country, are also ones who are hard core ideologs.
This will play well at home south of the mason dixon line but, it will destroy the party elsewhere.
The republicans just solidified themselves as a regional party.