I asked for further information because the McCain campaign had six visits but got billed nearly $28,000 while the Obama campaign had eight visits and was billed just under $22,000.
This is the response from the Police Department that Jason Webber, the city's public information officer, sent to me:
"The timing of the visit impacted the cost. A weekend visit necessitated more overtime because I have less personnel working that I can draw from for the dignitary protection detail. A weekday visit necessitated little overtime because I had a lot of personnel already scheduled to work. An overnight stay with no speech required less resources than a speaking event. The numbers you were provided represent overtime costs only. They do not include costs associated with on-duty personnel assigned to the detail."