Former CNN host Lou Dobbs is seriously thinking about running for the Senate in New Jersey, but his higher office aspirations don't end there. Dobbs might challenge Democratic Sen. Robert Menendez. ''A logical step for Lou, should he choose to go into public life, is to run for the next Senate seat in New Jersey, or to accept some kind of appointed position, nationally or in New Jersey,'' a spokesman said. Earlier this month, Dobbs left CNN after working for the news network for 29 years. The spokesman said the Senate could be a stopover for Dobbs—an "intermediary step"—on the way to the White House. Menendez brushed off any challenge. ''I'm concentrated on jobs, not Dobbs,'' he said.