This is the hardest thing to find. Despite what any member of the press will say, their reporting is slanted one way or another.
The best thing to do, especially with Senator Kerry or Senator Edwards, is look at their voting records. If the way they vote reflects your core values and beliefs, then by all means vote for them. If they do not reflect said values and beliefs, then you need to look at other places.
Personally, I don't look at what they promise, I look at what they've done. Reading politicians is a lot like reading a racing forum. There maybe a lot of facts to digest, but one way or another your own personal biases, values or belief system is going to slant you on way or another.
LABD