Gallup vs Zogby/Reuters

So, which poll is correct? Gallup is predicting a relatively easy Bush victory, with W taking pretty much all the battleground states that Gore took in 2000.

However, the Zogby/Reuters poll has the race in a dead heat.

Who's right? Apparently, Gallup makes some attempt to correct their poll for voter turnout trends. Since Republicans have had better turnout in recent years than Democrats, the Gallup poll is somewhat biased toward Republican voters. Thus, the stronger showing by W.

This outcome could potentially be thwarted by strong voter turnout in the swing states, plus high voter turnout among the newly registered, since Democrats seem to be registering new voters at a greater rate than Republicans.