The Rothenberg and CQ projections are just showing that there are more races in play, not that the Democrats will win those races. Tossup doesn't mean it's in the bag. Formerly safe Republican seats are now competitive which is good news for Democrats.

Most congressional races aren't polled and national polls are deceptive because they don't take into account local dynamics - "All politics is local." Both parties do internal polling and much of it never gets into the media. Again, money and get-out-the-vote efforts (base and undecideds) are the way elections are won.

Kudos to those who are working on campaigns, "boots on the ground" is the way we'll win this battle.