Obama leads big in key swing states

Some new polling data appeared today showing that Obama has a solid lead in Michigan, Wisconsin, Colorado and Minnesota (numbers in parens are the Obama leads).

Michigan (+16)
Obama: 54%
McCain: 38%

Wisconsin (+17)
Obama: 54%
McCain: 37%

Colorado (+9)
Obama: 52%
McCain: 43%

Minnesota (+11)
Obama: 51%
McCain: 40%