In order to maintain a constant level of high outrage it is essential to reduce actors to a binary Manicheistic world view.
To add to your point let me add some additional names:
Wendall Potter, a former health insurance exec
Jeffrey Wigand, a former cigarette executive
Frank Schaeffer, a former Evangelistic leader of a right wing religious group.
Gary Gensler, chairman of the CFTC, a former Wall Street derivatives expert, now major reformer.
I don't know anything about the candidate in question, except that as an African American woman she would provide a radical departure from the old boys network and that's why I am curious about Dr. Warren's comments even though she is, as you rightfully point out she was a right wing lawyer from OK.
http://www.thedailybeast.com/articles/2011/10/24/elizabeth-warren-i-created-occupy-wall-street.html
I was a Republican because I thought that those were the people who best supported markets. I think that is not true anymore, Warren says. I was a Republican at a time when I felt like there was a problem that the markets were under a lot more strain. It worried me whether or not the government played too activist a role.
. . .
Warren adds that she voted for both Republicans and Democrats and thought that neither party deserved to dominate. There should be some Republicans and some Democrats, she says. Browns campaign could make the same point. In a state dominated by Democrats, it might help to have a Republican providing some healthy opposition.
Here is what we know about the President's appointments so far:
Since the passage of Dodd-Frank in 2010, the C.F.T.C. has put in place dozens of generally sound new federal rules on transparency and oversight against nearly impossible odds, including relentless lobbying by big banks resisting regulation and severe Republican-driven budget shortfalls that have required tireless work from a skeletal staff. Though much work remains, credit for the progress that has been made largely goes to the commissions chairman, Gary Gensler, a Wall Street derivatives expert-turned-reformer, chosen by President Obama in 2009, and Commissioner Bart Chilton, a Democrat and a firm reform advocate, chosen by President George W. Bush in 2007 and renominated by Mr. Obama in 2009.
I give Dr. Warren's opinion a lot of weight and I know that she is unlikely to make her mind up on anything as superficial as her past employment, which as the examples above show, can be rather deceiving.