It’s an inevitable inverse variation, as one candidate goes up, one (or more) goes down. A few months ago Mitt Romney was tied against Pres. Obama in a hypothetical match-up, now Pres. Obama is leading by about 4 points. As more join Newt Gingrich’s campaign, the less support Mitt Romney in a general election, even though they are both Republicans. Pres. Obama also beats Newt Gingrich 51% to 39% in some polls.