WASHINGTON, DCAt a campaign dinner Monday, President Bush identified incumbency as the key issue in the upcoming presidential election. 'Look at my opponent's record on incumbency,' Bush said. 'John Kerry is not the president at this time. That's an indisputable matter of public record.' Bush added that the American public should seriously consider whether it wants to risk electing a president who has no experience heading a nation, has never resided in the White House, and does not have even one State Of The Union address under his belt. 