PhD holders that vote Republican

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Agriculture & Life Sciences

I very much doubt this is true for life sciences. If any thing, you’d expect biology PhDs to be more Democratic than, say, physicists, because they’re much more female.

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- Economics

This is absolutely not true. The vast majority of academic economists are Democrats; the percentage only seems low in comparison to some other fields, but it is still pretty high in absolute terms.

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Agriculture & Life Sciences

I very much doubt this is true for life sciences. If any thing, you’d expect biology PhDs to be more Democratic than, say, physicists, because they’re much more female.

"Agriculture & Life Sciences" are collectively the degree programs you'd expect to only see at land-grant institutions.  For example:  

--Agricultural Economics
--Animal Science
--Crop Management
--Food Science & Technology
--Forestry
--Horticultural Sciences
--Nutrition
--Poultry Sciences
--Rangeland, Wildlife & Fisheries Management
--Recreation & Tourism Sciences
--Soil Sciences
--Veterinary Sciences

All these fields have in common that they're concerned with the management of land, plants and animals for human use (i.e., agriculture.)  In contrast to biology, they involve an inherently interdisciplinary approach and tend to overwhelmingly attract students from agricultural/rural backgrounds (hence why they'd be Republican-leaning.)    

Ah, I see. I thought you meant life sciences in general, as separate from agriculture, rather than this specific category.