The bigger story should kick in come 2011, when more numbers come in and the redistricting commission starts meeting. But the fact of Washington state getting a 10th congressional district - this according to population figures released in December by the U.S. Census Bureau - has some significance all its own.
Symbolically, there's this: Washington becomes only the second state (California being the other) to grow large enough to develop a House delegation in two figures. Arizona, for example, grew but remains at nine.
Politically, this: The newly-added seat, which is highly likely to center on the Puget Sound, seems likely to push the state's House partisan split from its current 5-4 Democratic majority to 6-4. There are enough Republican population centers around the Sound to give them probably one more district in addition to three probably R-majority districts elsewhere (analogues to the current 3, 4 and 5), but probably not more than that. On the other hand, if Oregon rather than Washington had gotten the extra district - and the gap between the two states for the gain was not large - it would likely have gone from 4-1 Democratic to 4-2 Democratic, a Republican gain.
Where will the "new district" be fitted in? Most opinionators tended to focus on the southern Sound area, somewhre around Pierce and Thurston counties. But that's not a given; some of the largest numerical growth was in northern King. A number of possibilities exist.
But then, the commission has yet to weigh in.