Somewhat eccentric, or mad, losing power to Democrat? (5)

I believe the answer is:

dotty

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'somewhat eccentric' is the definition.
'dotty' can be an answer for 'eccentric' (I've seen this before). I'm unsure of the 'somewhat' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for dotty that I've seen before include "Feeble-minded" , "Mildly eccentric" , "Barking" , "Slightly mad (colloq.)" , "Silly; crazy" .)

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