A good question; there is a veritable fire hose of national polls that test the generic Congressional ballot (where the Democrats are doing very well). But what about in the competitive districts that really count, where the race to control the House will actually be won or lost? Such polls are harder to find but Latino Decisions has just released a poll of the 61 most competitive House districts as defined by the Cook Political Report, CNN and Larry Sabato's Crystal Ball site. As a bonus they did oversamples of individual minority groups so they could report reliable findings for those groups. The overall +13 in these districts for the Democrats looks excellent, the minority Democratic margins are solid and the anemic +7 for the Republicans among whites (roughly two-thirds of registered voters across these districts) is quite poor by contemporary GOP standards.