Calculation has its advantages, but no one likes naked calculation.
Al Gore adopted three utterly different personas in three national presidential debates.
It is Hillary's lot in life not to be able to fake it well...
If Hillary can't win the nomination - and it's clearly very, very hard for her - she's basically a stalking horse for McCain. She's preparing the demographic ground for McCain, by getting white working-class Democrats used to (if you will) not voting for Obama.
Bill Clinton was a liberal who could appeal to conservative-leaning Bubba voters.
Ultimately Rex Tillerson will reflect [Donald] Trump's policy towards Russia, which will be friendly up right up to the point of time it isn't.