Pennsylvania held primary elections on May 15, 2007, for statewide judicial office, and local partisan office. Luzerne County was using electronic vote-counting machines for the first time. Previously the county had used old-fashioned mechanical voting machines.

At the May 15 primary, 32 candidates won enough write-ins to be considered nominees of either the Democratic or Republican Parties. Luzerne County elections officials said the large number of write-ins was due to the fact that it is so much easier for voters to cast write-ins with the new machines, compared to the old machines. The new machines have an electronic keyboard which not only makes it obvious how to do a write-in, but eliminates the problems of poor penmanship.

The most important office for which voters nominated a write-in candidate was Luzerne County District Attorney. Republican write-in candidate Jackie Carroll needed 250 write-ins to be considered nominated, and received 455 write-ins.