Mrs. Edwards most probably knows her husband is a dirtbag. Just as Mrs. Clinton knew her husband was a lying cheating pos.
But she stays with the dirtbag to continue her position in society.
Also Mrs. Edwards cancer though eventually terminal is not taking her out any time soon. So you should hide this character flaw until that time arrives?
One more thing. At least Mr. Spitzers little lady thing was an attractive playmate. Unlike Mr. Clinton and Edwards who quite obviously have very poor taste in playmates.
You and I may not think so, and the editors of the various birdcage liners may not think so...but they think enough of their readers might think so.
I understand she's in remission until the next time comes that they need the press attention.