1.  D.L. Murray & N.R. Murray.  1995.  Marriage Index:  AR, MO, MS, TX, 1766-1981 (Broderbund CD-5):

MCCALEB, David M	DUNBAR, Ann Matilda	1828-Dec-21	Adams Co., MS
MCCALBE (sic), David	DAVIS, Florida A	1830-Oct-15	Warren Co., MS

David is old enough to have had a prior wife.

2.  1840 Census Index/Images (online at Ancestry.com, Image #7-8 of 47; extracted by Diana Gale Matthiesen):

1840

1840

Warren Co.

Roll 217

pp. 266B-267A

Ln. 19

Dav McCaleb

100 102 001 - 010 030

8 6 6 1 3 0 - 13 5 10 9 2 0

0/55/00000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 white male	4 or under	1835-1840	= Son?
1 white male	15-19	1820-1825	= Son?
2 white males	30-39	1800-1810	= David (b. 1803) = ?
1 white male	60-69	1770-1780	= David's father?
1 white female	5-9	1830-1835	= Daughter?
3 white females	20-29	1810-1820	= Florida (b. 1811) = ? = ?
8 male slaves	9 or under	1830-1840	= ? ? ? ? ? ? ? ?
6 male slaves	10-23	1816-1830	= ? ? ? ? ? ?
6 male slaves	24-35	1804-1816	= ? ? ? ? ? ?
1 male slave	36-54	1785-1804	= ?
3 male slaves	55-99	1740-1785	= ? ? ?
13 female slaves	9 or under	1830-1840	= ? ? ? ? ? ? ? ? ? ? ? ? ?
5 female slaves	10-23	1816-1830	= ? ? ? ? ?
10 female slaves	24-35	1804-1816	= ? ? ? ? ? ? ? ? ? ?
9 female slaves	36-54	1785-1804	= ? ? ? ? ? ? ? ? ?
2 female slaves	55-99	1740-1784	= ? ?
55	persons employed in agriculture

There's obviously more here than just a nuclear family, so it's hard to know who is in the household besides David & Florida — aside from the sixty-three slaves!  There are no children living with Florida in the 1850 census, so it's uncertain whether either of the youngsters listed here are hers and David's children.  The teen-age male could be David's son from a prior marriage.  Listed six lines below Florida's uncle, Jefferson DAVIS, who is listed one line below Florida's father, Joseph DAVIS.

3.  Kirk Bentley Barb.  1971.  "Extract from Genealogy of Jefferson Davis."  Appendix III, pp. 488-508 in Papers of Jefferson Davis, Volume 1, 1808-1840.  Haskell M. Monroe, Jr., and James T. McIntosh, eds.  Louisiana State Univ. Press, Baton Rouge.  [Rev. ed. of 1991 not seen.]

4.  Haskell M. Monroe., Jr. & James T. McIntosh, eds.  1971.  "Genealogy of the Davis Family."  Appendix IV, pp. 505-529 in Papers of Jefferson Davis, Volume 1, 1808-1840.  Louisiana State Univ. Press, Baton Rouge.  [Rev. ed. of 1991 not seen.]

5.  Ernesto Caldeira.  1983.  "Davis Family Genealogy."  Appendix II, pp. 402-416 in Papers of Jefferson Davis, Volume 4, 1849-1852.  Linda Lasswell Christ, Mary Seaton Dix, and Richard E. Beringer, eds.  Louisiana State Univ. Press, Baton Rouge.

6.  Genealogy of the Davis Family at Rice University.