It's an understatement to say all politicians are insincere. Of course they are - democrats, republicans, libertarians, socialists, communists, dictators - all of them. Yet some are more insincere than others.
Insincerity casts a wider net than does Lying. Think of it this way - those who are chronically insincere - and yet not lying "now" - will eventually lie (and do so sooner rather than later). Moreover, since they are skilled at gaining peoples' trust - their lies will carry more troublesome ramifications. Therefore the ability to detect insincerity and prevent it from doing damage is of profound value.
One of the best body language signals for an over-all personality trait of insincerity is a Chronically Contracted Forehead (not wrinkling, which comes with age of course, but active muscle contractions with dynamic forehead furrowing).
More than any of the 2016 Major Candidates for the U.S. Presidency - the 14 republicans or 3 democrats - Ted Cruz over-uses his forehead. To slice this even thinner, Senator Cruz contracts and elevates his central forehead (aka a central forehead contraction or CFC or Elevated CFC) extremely often. He has tried to dampen this facial display tendency by moderate Botox treatments - yet (without a heavy Botox treatment) this very telling nonverbal signal persists.
It's no coincidence that the professions where this facial dynamic is seen most frequently are: Politicians, Bad Actors, Sales Professionals and Newscasters (can you name some others?). All of these professions require acting (though not necessary formally defined as such). These individuals don't believe a significant proportion of what they say - and, if a person persistently practices such behavior, it is by definition "Chronic Insincerity".
This website serves as an objective reference source for the science and art of Body Language/Nonverbal Communication. In an effort to be both practical and academic, many examples from/of varied cultures, politicians, professional athletes, legal cases, public figures, etc., are cited in order to teach and illustrate both the interpretation of others’ body language as well as the projection of one’s own nonverbal skills in many different contexts – not to advance any political, religious or other agenda.
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Nonverbal Communication Analysis No. 3396: President Obama's Oval Office Address - Dialing up The Alpha
Nonverbal Communication Analysis No. 2702: Barack Obama - Anxiety and Non-engagement; Body Language Signals
Nonverbal Communication Analysis No. 3287: Hillary Clinton, Email Servers and Crisis Management
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Nonverbal Communication Analysis No. 3277: John Kasich reflecting on Debate
Nonverbal Communication Analysis No. 3375: Donald Trump Questions Ben Carson's Stabbing Story
Nonverbal Communication Analysis No. 3255: Donald Trump and a Body Language Signal of Social Fear and Hesitancy