This map depicts the results of the 2000 Iowa Republican presidential caucuses, showing the percentage of the popular vote received by the winning candidate in each county.
Bush:

  30–35%
  35–40%
  40–45%
  45–50%
  50–55%
  55–60%
  60–65%
Forbes:

  35–40%
  40–45%
  50–55%
  55–60%
Bauer:

  25–30%
  40–45%
Election results provided by the Dave Leip's Atlas of U.S. Presidential Elections
Base map provided by awmcphee 
This file has been created using a standardized map of a state's counties: Iowa county map, cb 500k.svg. A full list of available maps exists at Category:Standardized SVG county maps of US states.
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