National polls will skew in favor of democrats. Because larger blue states such as CA & NY & IL have huge surplus democrat votes.
For example CA had 5 million votes advantage for democrats in one presidential election cycle! Electorally, that is a lot of surplus unneeded votes.
So it all boils down to purple states. If the poll was limited to just FL, OH, NC, WI, NV, PA, IA then it would mean a heckuva lot more.
National polls will skew in favor of democrats.
national polling is total waste of time...