In an ideal world, determinations of political front-runners would be made based on an aggregate of these different metrics. If we relied solely on polling numbers to determine the front-runners of the Democratic Presidential Primary, it would seem that Warren comes out on top or perhaps Biden. However, that is exactly the narrative that they want you to buy into. It benefits them and their stock-holders if Sanders and his grassroots political revolution are constantly under-represented, invalidated, or discredited by the media. Keep in mind Biden was leading in many polls prior to the whistle-blower coming forward regarding Trump’s dealings with Ukraine and Trump’s subsequent backlash at Biden. Even still, these numbers fluctuate from poll to poll, state to state, and day to day.
The Political Historian 