Reply #11: Don't know about the poll numbers, but most Presidents have had

[mcscajun]

more than one Chief of Staff during their term(s).

The average term of service for a White House Chief of Staff is a little under two and a half years.

H.R. Haldeman resigned at Nixon's request during the Watergate Scandal - I don't know how low Nixon's poll numbers were at that particular point in time, but you can bet they were in Bush territory.

Rumsfeld resigned as Ford's COS to be replaced by...Dick Cheney.

Reagan had four Chiefs of Staff during his two terms, Bush the Elder had three, Clinton had four.

Andy Card stuck it out for five years. That's a record.