Frank Lautenberg, the overwhelming favorite to become the first five-term United States Senator in New Jersey history, is planning on finishing the 2008 campaign with about $500,000 cash-on-hand, according to sources familiar with the Lautenberg campaign. Comfortable with his own polling that shows he’ll defeat Republican Dick Zimmer, the 84-year-old incumbent has no plans to use all his money this year. That includes increased advertising dollars in areas of the state where congressional and local races remain competitive. And Lautenberg has not been making major contributions to other Democrats in close races throughout the country. But in the event that Zimmer surges at the end, Lautenberg will be prepared.