I nominate Maxine Waters as her replacement...
Sheila Jackass-Lee could squash Maxine in a heartbeat in one of those "overthrow the chief" African wrestling contests, in which the new guy tries to throw the old guy off his stool and take over the tribe/village/whatever.
Sheila's got sumo buttweight on her, she'd check in as a yokozuna even without looking at her stupidity credentials, which are massive.