Interesting/Weird Fact of the Day: Maine and D.C.

Q: What do Maine and the District of Columbia have in common? 

A: They rank lowest for 2010 SAT scores by state: Maine for the lowest average reading score in the country at 468  points vs. the national average of 501; and the District of Columbia for the lowest average math score in the country (464 points vs. 516 national average).  For math, Maine ranks #50 and for reading the District of Columbia ranks #50.  

It doesn't seem like Maine and D.C. would have that much in common to share the bottom rankings for SAT scores, does it? 

(FYI: Data for the 2011 SAT will be released on Wednesday.)   

Update: "Maine is the only state using the SAT to comply with No Child Left Behind accountability standards," and they therefore have a 92% SAT participation rate, the highest in the country.  As Tom points out in the comments, that could be one explanation for Maine's low average test scores - almost all high school students take the SAT, even those with no intention to attend college.  However, nearby Massachusetts has the second-highest SAT participation rate of 86%, and it has average test scores above the national means (512 for reading, 526 for math)?