Well, if we can’t have it in the irradiated husk of D.C., we’ll put it in the irradiated husk of Pyongyang.
Detroit. The city could use a lift.
Denver. Let’s move the capital from the first stupidest place to build a city to the second stupidest place.
I was thinking St. Louis would probably be near the center of US population, and as it turns out it’s pretty close. Put it there temporarily, and build a new DC nearby.
ETA: The Median center is in Southern Indiana. St. Louis isn’t far from from that either.
Fuck no. Keep them away.
Hmm. It’s large, de facto segregated, and has miserable summers. This could work.
I like the idea of New York. If we’re lucky it’ll get nuked again. In that scenario Philadelphia would also be a good choice, but only if we can find a way to make Independence Hall bombproof.
It would be a good idea given climate change to move it inland and south, so Texas it is. There’s lots of room in West Texas, and if they can build a city in a malarial swamp they can build one in barren desert.
Truth or Consequences.
I actually like the idea some place like Des Moines, Omaha, Kansas City, even St. Louis. They’re centrally located in the central time zone with good highway access, lots of cheap land around, would draw population away from the coasts.
The surface of the Sun.
Mexico. No one would think of looking there.
You’re assuming Obama survived the war. It might be the former Sec of Agriculture, or someone of that ilk. (OK, I forgot until it was too late that Romney couldn’t be in office yet 
)
As for Texas, hell no between the hurricanes, summers straight out of the depths of Hell, and giant cockroaches, I’ll happily stay up here. I like St. Louis for it’s geographic center-ness. Maybe the Federal Government could purchase Missouri’s bootheel as the new Federal District.
The proper term for them is “Congressmen”.
Why not some place in South Dakota. So obscure, my senior year of high school, even Rand McNally couldn’t place it on a map! Terrorists would never find us.
Since it’d be likely that I went up with DC, I doubt I would be able to answer anything.
“But we can’t send men to the Sun–it’s too hot!”
“That’s OK, we’ll send 'em at night!”
The geographical center of North Dakota.
To jump on one of my dad’s bugaboos…
Decentralize it. Congress goes one place with the judiciary and the White House. But the federal departments can be spread around the country. Agriculture to Omaha. HHS to San Antonio. FBI to Chicago and so forth. I think it could work these days.
The great Dismal swamp. Its close and its the same weather and terrain as DC. The founder fathers thought the capital should be in a God forsaken swamp, who are we to argue? Most of us won’t even notice the change.
Congress doesn’t even go one place. They meet online.
I wouldn’t name any existing large city, because it would be too hard to insert the “capitol infrastructure” into an existing city. Also, I would choose somewhere where three states meet, so there’s no problem about just one state having to give up land.
My choice is near Cairo, Illinois, where Missouri, Illinois, and Kentucky meet; it’s “in the east” (where most of the people are), but not too far east nor too far north or south; also, it’s where two major rivers meet.
If you need an “interim” city, either St. Louis or Kansas City.