All you have to do is copy and paste this list into the Items field for your dropdown box in RSForm:

AL | Alabama
AK | Alaska
AZ | Arizona
AR | Arkansas
CA | California
CO | Colorado
CT | Connecticut
DE | Delaware
DC | District of Columbia
FL | Florida
GA | Georgia
HI | Hawaii
ID | Idaho
IL | Illinois
IN | Indiana
IA | Iowa
KS | Kansas
KY | Kentucky
LA | Louisiana
ME | Maine
MD | Maryland
MA | Massachusetts
MI | Michigan
MN | Minnesota
MS | Mississippi
MO | Missouri
MT | Montana
NE | Nebraska
NV | Nevada
NH | New Hampshire
NJ | New Jersey
NM | New Mexico
NY | New York
NC | North Carolina
ND | North Dakota
OH | Ohio
OK | Oklahoma
OR | Oregon
PA | Pennsylvania
RI | Rhode Island
SC | South Carolina
SD | South Dakota
TN | Tennessee
TX | Texas
UT | Utah
VT | Vermont
VA | Virginia
WA | Washington
WV | West Virginia
WI | Wisconsin
WY | Wyoming

If you want the state spelled out in your database as well as on the site, use this list:

Alabama | Alabama
Alaska | Alaska
Arizona | Arizona
Arkansas | Arkansas
California | California
Colorado | Colorado
Connecticut | Connecticut
Delaware | Delaware
District of Columbia | District of Columbia
Florida | Florida
Georgia | Georgia
Hawaii | Hawaii
Idaho | Idaho
Illinois | Illinois
Indiana | Indiana
Iowa | Iowa
Kansas | Kansas
Kentucky | Kentucky
Louisiana | Louisiana
Maine | Maine
Maryland | Maryland
Massachusetts | Massachusetts
Michigan | Michigan
Minnesota | Minnesota
Mississippi | Mississippi
Missouri | Missouri
Montana | Montana
Nebraska | Nebraska
Nevada | Nevada
New Hampshire | New Hampshire
New Jersey | New Jersey
New Mexico | New Mexico
New York | New York
North Carolina | North Carolina
North Dakota | North Dakota
Ohio | Ohio
Oklahoma | Oklahoma
Oregon | Oregon
Pennsylvania | Pennsylvania
Rhode Island | Rhode Island
South Carolina | South Carolina
South Dakota | South Dakota
Tennessee | Tennessee
Texas | Texas
Utah | Utah
Vermont | Vermont
Virginia | Virginia
Washington | Washington
West Virginia | West Virginia
Wisconsin | Wisconsin
Wyoming | Wyoming

If you want just the initials, use this list:

AL | AL
AK | AK
AZ | AZ
AR | AR
CA | CA
CO | CO
CT | CT
DE | DE
DC | DC
FL | FL
GA | GA
HI | HI
ID | ID
IL | IL
IN | IN
IA | IA
KS | KS
KY | KY
LA | LA
ME | ME
MD | MD
MA | MA
MI | MI
MN | MN
MS | MS
MO | MO
MT | MT
NE | NE
NV | NV
NH | NH
NJ | NJ
NM | NM
NY | NY
NC | NC
ND | ND
OH | OH
OK | OK
OR | OR
PA | PA
RI | RI
SC | SC
SD | SD
TN | TN
TX | TX
UT | UT
VT | VT
VA | VA
WA | WA
WV | WV
WI | WI
WY | WY