In 2012 the polls missed in favor of Romney... how do you fit that in? And in 2020 the polls were more accurate in most areas than in 2016, but had misses in p

In 2012 the polls missed in favor of Romney... how do you fit that in? And in 2020 the polls were more accurate in most areas than in 2016, but had misses in particular areas (e.g. south Florida) that led to an early "deja vu" narrative that didn't pan out. So maybe some of these "easy things" were done... and what's left (like missing more on the congressional races than the presidential one) are not actually the same thing after all.