Representative Harold Ford (D) has taken a 48% to 43% lead over Mayor Bob Corker (R) in Tennessee's increasingly competitive race for U.S. Senate (see crosstabs). Ford has an edge with unaffiliated voters and leads by a whopping 70% to 23% among moderates. Ford has gained ground fast in recent weeks. A Rasmussen Reports poll conducted September 5 showed him trailing by a single point, 44% to 45%, after lagging by six points in August, twelve in July. We are now shifting this race from the "Toss Up" to "Leans Democrat" column in the Senate Balance of Power summary. Just...