Juan Carlos Zapata, a state representative from the Kendall area, is gunning for Miami-Dade County Commissioner Joe Martinez's job. The legislator is going to be termed out of office in 2010, so he's laying the groundwork for a run at Martinez's seat in 2012. Already, the first Colombian-American elected to the Florida Legislature has asked the Miami-Dade Commission on Ethics if he can continue lobbying county officials while he runs for commissioner. This past March 27, ethics Executive Dir