In looking at Gallups polling trends since the 1948 election, it is apparent that in every INCUMBANT election where the race for the White House was fairly tight (1976, 1980, 1992), if the incumbant fell behind the challenger in Gallops polls......even briefly....during the summer months, the incumbant lost the election.
The only exception to this is the 1948 election.
In every other INCUMBANT election since 1948 (ie 1956, 1964, 1972, 1984, and 1996) the challenger never closed on the incumbant and resulted in large landslides for the incumbant party.
Although Bush appears to have closed the gap with Kerry in Gallup's latest poll (48 Bush - 47 Kerry on 6/22), Bush has already fallen behind Kerry twice (Bush 46 - Kerry 47 on May 21) and (44 Bush - 50 Kerry on 6/3) in Gallops polls.
Gallups next poll is due out in the next few days, possibly during the news of Kerrys running mate selection.
If Bush falls behind Kerry in Gallups early July poll, will history prevail and Bush be defeated or will Bush pull a Truman and a 1948 style comeback?