Independent of all Team Red/Team Blue nonsense she is an almost cartoonishly horrible person (look up Gerald Amirault or Kenny Waters, among other persons she deliberately and over a course of years advocated to be kept in prison despite having proof of their innocence). It would be wonderful to see her fail spectacularly in either the primary or general.
That much being said, I neither think Brown will run nor would support him if he did. I'd probably vote third party or spoil my ballot in another general election involving Coakley.