Walz is a perfectly good VP candidate. Anybody who thinks Shapiro would make a noticeable difference in the polls needs to log off and go touch grass. Biden won PA by 80,000 votes. A poll on Election Day would have had Trump or Biden winning depending on the poll.
Folks need to relax. GA, PA, WI, MI, AZ and NC can’t be judged on silly ass polls when the margin is this thin. Dems just need to do their best in turning people out and let the chips fall where they may.