Re: sweep accounts, the Kabuki theater over the debt negotiations and the potential for roiling the markets.
My major sweep account is with Fidelity in one of their government money market accounts. Always set to NAV of $1.00, day after day. Safe as houses?

Back when the markets took their 2008 beating the $1.00 broke and made a low $0.20.
FDIC covers $250k. Not a problem for me back then. Major problem now.
Just something to keep in mind.
..whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government..