There's no doubt that Oprah Winfrey gave Barack Obama's campaign a boost this past weekend in Iowa. I've seen different numbers about how many people turned out for one rally (10,000 versus 29,000), but the most important statistic may be the 20,000 people who gave their names to the Obama campaign to get tickets. That list helps Obama in two ways: as a list to call and urge support on caucus night; and as a list that may include people who were not planning to caucus and who may do so now. Another interesting tidbit: In photos from the O-rally, I noticed on signs what may be a new slogan for the the Obama campaign: "Change We Can Believe In," a not so subtle suggestion that Hillary Clinton is someone not to be trusted. Obama is trying to raise negatives around Clinton without hurting himself. Sen. Clinton contrasted the Oprah appearances with events with her mother and daughter. This round goes to Obama.