I think we're going to go to DC for a few nights over spring break.
I just got a great travelzoo rate at the four points sheraton (5 blocks to white house) for $89 per night weekend. That is the best I've seen since I've been watching.
A couple questions:
That moonlight tour mentioned - do I have to book it now? Which tour company do you recommend for that? I am interested - dd isn't much of a walker and I know she'll be tired at the end of the day - so riding to some sights will be beneficial.
I already wrote my congressperson to ask for White House tour tickets, not sure if I can get in - not too much notice.
I am planning on hopefully the White House, maybe 2 museums, the zoo and the Moonlight Tour (if affordable). Anything else I should squeeze in with a 7 and 8 year old? I know we can't do it all...
I unfortunately wouldn't count on getting the White House this close (don't know when your spring break is, but I've had a couple friends try and get them within three months and it never worked out).
I mentioned this earlier, but you're not too close to get the Pentagon tour!
http://pentagon.afis.osd.mil/tour-selection.html

The Newseum is pretty affordable and VERY nice, as well. My younger brother really liked the Spy Museum, but it was a little more expensive if I remember correctly.