If they are already motivated to turn out for Katherine Harris in the general election, you'd make sure that they're educated about the whole ballot. Usually, the House seat is just below the Senate seat on Federal section of ballots. It would be hard to skip it.
Maybe even get Ms. Harris to explain how to vote in that district.
-PJ
Just about anyone actually motivated to turn out especially for Katherine Harris is ultra hardcore GOP anyhow and is hardly the voters you need to worry about educating...