Battleship was really made obselete by the Aircraft Carrier in World War II. As for your claim that the Midway was designed as a World War II ship...well I'd like to send you about six books about the design of the ships and how they were incorporated but I'll settle by saying that the Essex class carriers were never built the same - nor for normal reasons but because as the war progressed new things were learned about Aircraft carriers that allowed that paticular ship class to evolve as THE World War II Era Carrier.
The Midway was designed with several significant changes, no one would ever mistake it for a World War II Carrier. I would argue that it was built as a POST World War II Era Carrier, including all of the design changes learned from the combat of World War II, but it wasn't built to combat the Japanese or German fleets it was built to project power into the next century.
Further if you continue to exam the lists of ships developed by the US Navy only three Midway-class Carriers entered service, out of the 77 fleet carriers that were proposed for service in the US Navy.
This would also be a good time to reference this:
http://www.geocities.com/patrolgroup511/carrier.html
Note the number of Essex and Independence (Later reclassified from fleet carrier to Light Carrier) produced during the war, as opposed to the number of Midway produce total.
Obviously the design of the Midway was so lacking it didn't even see production in the post war, as the Navy shifted over to nuclear power, like the Enterprise class.
If you really want to argue that the Midway design classifies as World War II because it incorpates things learned during the war, then I'd like to argue that the USS Ronald Reagan should be put on your list, for the very same reason.
As for the poll...well, picking ships that are your personal favorites and putting them on the list, while leaving out significant others doesn't seem the way to run a poll to me.
[EDIT]
Regarding the San Francisco:
San Francisco
New Oreleans-Class
Commissioned on 10 February 1934
Displacement 9,950 Tons, Dimensions, 588' 0" (oa) x 61' 9" x 22' 6" (Max
Portland
Portland-class
commissioned 23 February 1933
Displacement 9,950 Tons, Dimensions, 610' 3" (oa) x 66' 1" x 24' (Max)
Indianapolis
Portland-class
Commissioned 15 NOV 1932
Displacement 9,950 Tons, Dimensions, 610' 3" (oa) x 66' 1" x 24' (Max)