Eric Cantor showed that you don't need investment banking experience to land a $3.4 million gig investment banking. Of course this isn't a meritocracy and he's being bought for his connections, not his skills.
Yeah, when an ex-congressman becomes a company's Vice President of Government Affairs and announces they're "going to the private sector" it's quite laughable.
I think Phil Gramm may have had a "real" finance job at one point after he left the Senate; but then again he's a PhD economist.
I'd like to see a Where Are They Now on former members to see how many are also in lobbying or access-based positions like Cantor's.