The Texas State Board of Education is a fairly obscure group of individuals, staying below the radar except for the occasional ruckus over whether evolution's a fraud or if math word problems should all include highlights from Ronald Reagan's career.That ended this fall, when an unhinged screed published by member Cynthia Dunbar (from Richmond!) became a blogosphere sensation.The essay -- no longer available at the Christian site she wrote it for -- essentially argued Barack Obama was conspiring