Via Twitter yesterday, from Senator Claire McCaskill (D):

Claire McCaskill ‏@clairecmc
WA state,Bernie wins caucus,where many can’t attend because of work. Primary w/open mail in ballot Hillary wins,w/twice the turnout.Rigged?
8:26 PM – 25 May 2016

Point well taken. Subtle, too.

If I’m ever in a back alley knife fight I want Claire on my side.