However, when it comes to Elizabeth Warren, the senator has remained mostly unflappable during the two debates, performing very strongly on both occasions, to date.
Although there is still a long way to go it's possible that Warren has already had her defining moment of the campaign when she expertly shut down the former Maryland congressman John Delaney.
Seeking to set himself apart from the crowd, Delaney attempted to take a more conservative approach to the debate and suggested that Democrats shouldn't pursue 'progressive policies that are popular with the left-wing of the party.'
Warren wasn't about to stand there and take this from the man who is best known for looking unimpressed on a slide and proceeded to lay the smackdown on him.
I can’t understand why anyone goes through the trouble of running for president of the United States just to talk about what we can’t do and what we shouldn't fight for.
Warren's 31-word massacre of Delaney won rapturous applause from the audience and it quickly became a viral meme, with many joking that she had just 'murdered' the 56-year-old right there in Detroit, Michigan.
Extremely rude of Elizabeth Warren to murder John Delaney on national television like this.