How Birthrates Impact Demographics

"Among the 50 states plus Washington, D.C., white total fertility correlates at a remarkably strong 0.86 level with Bush’s percentage of the 2004 vote. (In 2000, the correlation was 0.85.) In the social sciences, a correlation of 0.2 is considered “low,” 0.4 “medium,” and 0.6 “high.”

You could predict 74 percent of the variation in Bush’s shares just from knowing each state’s white fertility rate. When the average fertility goes up by a tenth of a child, Bush’s share normally goes up by 4.5 points."

Thanks to Laura Kranz