North Texas rarely is viewed as a national battleground in the fight for control of Congress, but two of the hottest races in the country are in the region. That's because two Democratic incumbents long considered relatively safe -- U.S. Rep. Eddie Bernice Johnson of Dallas and U.S. Rep. Chet Edwards of Waco -- are now considered vulnerable as Republicans seek to wrest control of Congress from the Democrats. Johnson is facing Dallas Pastor Stephen Broden, and Bryan oil and gas executive retiree Bill Flores is challenging Edwards. Broden recently made national news by picking up an endorsement from former...