More often than not, a person categorizing themselves as ‘independant’ tend to be nothing more than liberals ashamed to say they’re Democrats.
Today’s polls should give a better indication of any true movement.
If you look at turnout over the last 20 years, the number of Dems to Repubs is usually about even. The maximum difference has been + 4% for the Democrats. No way is there going to be a 10 percentage point difference on election day. Since most polls are now using a turnout model of around + 10% for the Democrats, these polls are way off and leaning much further to the left than they should be.