The nonpartisan group Cook Political Report has shifted half a dozen House races toward Democrats and two toward Republicans, as Democrats see their financial advantage and enthusiasm rise after Vice President Harris replaced President Biden at the top of the ticket.
The changes do away with one toss-up race and add three new ones, for a combined total of 24 toss-up contests on the table this fall.
Democrats need to net only four seats to take the majority this fall, and they...