The Cook Political Report shifted 10 House seats in Democrats' favor this week. There are now 60 competitive seats (54 held by Republicans) and 26 toss-up seats total.

Between the lines, from Cook's Dave Wasserman: Republicans would keep the House if both parties picked up an even amount of the toss-ups, but Democrats would take the House and net 28 seats if the competitive seats split evenly.

One race to watch: Maine's 2nd district, which shifted to a toss-up and where Democrats are trying (again) to oust Republican Rep. Bruce Poliquin. Wasserman reports that district hasn't voted out an incumbent in 102 years.

Go deeper with the full ratings changes here.