If you are looking for piecemeal work check with the local companies who service ATM machines in the areas you want to stay in. When Diebold or another company sends a tech out nights or weekends some security guard goes along. Its considered high risk, because sometimes the machines are purposely sabotaged to force a tech to a location in the middle of the night. normal pay is around $25 an hour from when you get the call to when you get home, plus a mileage allowance.
Also check, I did personal protection for a while, but I will warn you, the folks you deal with (politicians) are the lowest forms of life in the country. And no, party doesnt matter.