The news that Michael Brown has resigned from FEMA renders the DU post Bush can't fire "Brownie" because "Brownie" knows Too Much... a bit moot.
That links to the Nov 3, 2004 GovExec report "How FEMA delivered Florida for Bush":
Now that President Bush has won Florida in his 2004 re-election bid, he may want to draft a letter of appreciation to Michael Brown, chief of the Federal Emergency Management Agency. Seldom has any federal agency had the opportunity to so directly and uniquely alter the course of a presidential election, and seldom has any agency delivered for a president as FEMA did in Florida this fall...
In 1992, the last time a major hurricane pummeled Florida in the homestretch of a presidential election, FEMA was caught with its pants down. Its response to Hurricane Andrew was disorganized and chaotic, leaving thousands without shelter and water. Cleanup and resupply efforts were snarled in red tape. After watching the messy relief efforts unfold, lawmakers questioned whether FEMA was a Cold War relic that ought to be abolished.
For then-President George H.W. Bush, the scene proved to be a public relations nightmare. He managed to regain his footing and win Florida three months later, but his winning margin was dramatically reduced from 1988...
In 2004, George W. Bush and FEMA left little room for error. Not long after Hurricane Charley first made landfall on Aug. 13, Bush declared the state a federal disaster area to release federal relief funds. Less than two days after Charley ripped through southwestern Florida, he was on the ground touring hard-hit neighborhoods...
[..FEMA did a very good job...]
But, wait, there's more theorizing at the DU link.