Indeed, despite Cain's surge among Republicans, few Americans know enough about him to form an opinion. Twenty-four percent of Americans say they have a positive opinion of Cain, while 18 percent have a negative opinion. Twenty percent describe themselves as "neutral," while 38 percent say they haven't heard of the new leader in the GOP race. Amazingly, nearly half of Republican primary voters either haven't heard of Cain or have no opinion of him. But, among those who have an opinion, Cain's numbers are incredibly positive: 52 percent have a positive opinion of him, compared to just six percent with a negative opinion. One more piece of better news for Democrats: Registered voters now prefer a Democratic-controlled Congress by a four-point margin, 45 percent to 41 percent. That is a ten-point turnaround from late August, when voters said they preferred a Republican-controlled Congress, 47 percent to 41 percent. The NBC News/Wall Street Journal poll was conducted Oct. 6-10 by the bipartisan team of Hart and Republican Bill McInturff. The poll surveyed 1,000 adults, for a margin of error of +/- 3.1 percent. There were 837 registered voters for 2012 election questions; those carry a margin of error of +/- 3.4 percent. For the oversample of Republican primary voters, there were a total of 336 voters surveyed, for a margin of error of +/- 5.3 percent.