[CarrotAndStick]

http://www.ptinews.com/pti%5Cptisite.nsf/0/9563ACDCD7B6193F652570C40015FF34?OpenDocument

Since 1976, 58 per cent of those executed in the US were white while 34 per cent were black, according to the Death Penalty Information Center.

[DumpsterDiver]

Here's a couple of more sources:

Race of Death Row Inmates Executed Since 1976 [Execution information accurate as of November 18, 2005 following execution in North Carolina.]

RACE OF DEFENDANTS EXECUTED IN THE U.S. SINCE 1976

BLACK
336
34%
HISPANIC
6
36%
WHITE
576
58%
OTHER
22
2.3%

NOTE: The federal government counts some categories, such as Hispanics, as an ethnic group rather than a race. DPIC (Death Penalty Information Center) refers to all groups as races because the sources for much of our information use these categories.

CURRENT U.S. DEATH ROW POPULATION BY RACE

BLACK
1,432
41.7%
HISPANIC
350
10.4%
WHITE
1,553
45.5%
OTHER
80
2.3%

(Death Row Population Figures from NAACP-LDF "Death Row USA (Julyl 1, 2005)")

Source

Also see Bureau of Justice Statistics Capital Punishment Statistics
http://www.ojp.usdoj.gov/bjs/cp.htm