Even with their candidate out of the race, Fred Thompson’s supporters can make a big impact in Florida. They should do so by supporting Rudy Giuliani. More than any other candidate, Rudy matches Thompson’s conservative credentials in the three most important areas: he offers a conservative economic policy, an explicit promise to nominate only “strict constructionist” judges, and a strong dedication to national security. On the economy, social issues, and defense, a Giuliani presidency will take the nation in a clearly conservative direction—and he can actually beat Hillary Clinton or Barack Obama in November. With a win—or a strong showing—in...