President Obama told New Orleans on Sunday that five years after Hurricane Katrina he was sticking with them in their endless recovery.

But it was Republicans who got the rainbow today, a historic new Gallup Poll showing the party of Lincoln has now built a whopping 10-point lead -- 51 to 41 -- among registered voters over Obama's Democrats in the revealing generic congressional ballot for the Nov. 2 elections.

That's by far the largest margin ever earned by Republicans since Gallup began tracking such a predictive political indicator in 1942. That was so long ago everything was in black-and-white and Joe Biden wasn't even a senator yet!

The 10-point lead is also twice as big as the five-point spread the GOP enjoyed going into the 1994 midterm elections under Democrat President Clinton when the GOP seized control of both houses of Congress for the first time in four decades.

Usually the numerical dominance of Democrats gives that party a....