Alzheimers come about from an aggressive body state…that essentially erodes itself with its high level of ‘readiness’ to attack .
The body is in a state of fear (so my stab in the dark guess that conservatives might suffer from it marginally more than anyone else ).
Parkinson’s is a disease where there is a balance of forces against each within the brain….each leaning heavily against each other…..like a tug of war….in balance…wearing out the brain.Reminds me of the liberal brain.Balanced.As they tug against each other ..they wear out the ‘doing’ juices ( dopamine).
Cancer is for people who are defenceless and open ..too open ..to all.Their defences are muted and they incur a cost for that.People with cancer will have an open spirituality.( Eva Cassidy..look at her voice….see is so defenceless and unguarded ..that voice was/is heavenly …she had no defences /layers…sheer spirit )
OK..now ..I know alot of this is mostly non-sense…but I know there is a nugget of truth in here somewhere amongst this caricuture.I know rightwingers get Parkinsons and cancer etc etc is a bit over the top…….but I think there will be a measurable yardstick with which the temperaments of different people are directly related to the diseases they get and the political eco-system of their thoughts.
Remember right and left wing party affiliations are not usually dependent on whether someone is a left winger or right winger.This is not about political parties…but political individuals.
In the US ..we have a purifying process where individuals are becoming more closely aligned to parties that represent the inner political poles of mind …but that is not a given in most societies….e.g You can be a conservative through culture/birth yet be a liberal inside quite easily in the UK or a rightwinger in the socialist party ..eg Blair and Labour.
Heres an article that presents the case for Alzeheimers being related to immune defence.
http://www.nytimes.com/2010/03/09/health/09alzh.html?em
I know the disease I’m mostly likely to get is Parkinsons but not Cancer.I’m fairly certain of that.Maybe another 20 years and we shall see.

http://www.highlighthealth.com/research/alzheimers-disease-may-protect-against-cancer-and-vice-versa/
someone beat me to it
validated
also religious people more likely to get parkinsons
more validation