Is there any indication that Vicki Kennedy is a good campaigner?
We know that she is smart, was an excellent partner for her husband, and it seems like insiders think the world of her, but does that mean she can actually run against Scott Brown? The precedents with Niki Tsongas and (gulp) Caroline Kennedy are not promising.
Realistically speaking, the precedents with Massachusetts' most prominent statewide Democrats aren't looking good for Democrats either, in the case of Scott Brown. Coakley had the right party designation and a typical Senate candidate resume; Vicki Kennedy simply has a party designation and the surname of her late husband.
Democrats are going to want to energize the liberal base in and surrounding Boston in order to defeat Senator Brown.