An amateur's opinion is not enough for a serious news publisher, but this is just a blog, so here comes my speculation on the body language of Republicans versus Democrats.
When you watch Republicans on TV, they often send off signals of something being off. They look uncomfortable, defensive, embarrassed, even scared. It's as if they feel the weight of their conscience and subconsciously send off signals of guilt.
Democrats, on the other hand, act with animosity, outrage, engagement and spirit. They speak their mind, freely and without hesitation,
Simply put, Democrats come across as honest, whereas Republicans do not. Coincidence?