Independents, women and Wayne County voters helped boost Democrat Barack Obama to a 7-point lead over Republican John McCain in the presidential race in Michigan, according to a Detroit Free Press-Local 4 Michigan Poll conducted this week. Obama's 46% to 39% statewide advantage is especially aided by a 39-point bulge among voters in Wayne County, including Detroit. Elsewhere in metro Detroit and outstate, Sens. McCain and Obama are virtually tied, according to the poll of 600 likely voters. Twelve percent are undecided and 3% support third-party candidates. Obama has significantly more support among voters younger than 35 and an 11-point...