Our Department of Curious Statistics produced this nugget: More Democrats voted in the runoffs in Dallas and Tarrant Counties than voted in the primaries a month earlier. In Dallas County, 77,938 people voted in the Democratic Senate primary in March. In April, that number increased significantly, to 92,408. Tarrant County's numbers did the same hat trick, increasing to 39,094 in April from 36,812 in March. In Dallas, the additional voters broke almost two-to-one in favor of former Dallas Mayor Ron Kirk. In Tarrant County, the numbers were more dramatic: The combination of increased turnout and the absence of Ken Bentsen and other candidates to dilute support put more than 5,900 additional votes in Kirk's column. Add in what happened in other counties, like Travis and Harris and Bexar, and you have strong evidence that Democrats are rebuilding their political infrastructure.