From The Allen Report:
"The Republican National Committee has been pointing out that a small shift in votes would have made a big difference. A shift of 77,611 votes would have given Republicans control of the House, according to Bush's political team. And a shift of 2,847 votes in Montana, or 7,217 votes in Virginia, or 41,537 votes in Missouri would have given a Republicans control of the Senate. In addition, the party has calculated that the winner received 51 percent or less in 35 contests, and that 23 races were decided by two percentage points or fewer, 18 races were decided by fewer than 5,000 votes, 15 races were decided by fewer than 4,000 votes, 10 races were decided by fewer than 3,000 votes, eight were decided by fewer than 2,000 votes and five races were decided by fewer than 1,000 votes."