The key to Tuesday's Republican earthquake, where the GOP recaptured the Senate and increased their majority in the House, was turnout, says the Gallup polling organization. "The last CNN/USA Today/Gallup poll before the election showed Republicans winning the national congressional vote by a margin of 51 percent to 45 percent, virtually identical to the actual voting results, according to preliminary reports," Gallup reports on its Web site Thursday. "The poll also showed that Republicans expressed greater enthusiasm for the election than did Democrats, and that the projected turnout rate for Republicans was 43 percent, compared with 36 percent for Democrats."...