An audience member at a Fox News town hall challenges Sanders on his embrace of democratic socialism and asks how it would differ from the Soviet Union.
It's nearly impossible to blame Biden's stutter for him thinking the name of the most ubiquitous semi-automatic rifle in the United States is the 'AR-14.'
While this newest 'gaffe' could be the result of the stresses of the campaign trail, it follows numerous calls for Biden's mental health to be evaluated.