Over the past year, every member of the often-ballooning and occasionally shrinking field of Democratic presidential candidates has tried to convince an uncommitted and nervous electorate that they are the candidate to defeat President .
Every candidate has their own theory of how to effectively oust the incumbent. Former Vice President has argued that his career credentials and familiarity with a broad swath of voters put him in the best position to trounce Trump. Vermont Sen. has said that proposing bold liberal policies will inspire unprecedented turnout and win over who backed Trump in 2016. Before she dropped out, California Sen. had posited that the key to defeating the president was firing up disengaged African-American voters in swing states.