In a major boost for McCain, Romney signaled earlier Wednesday that he's not ready to commit to a costly campaign in the states holding primaries and caucuses next week.

Several officials said that on the heels of a defeat in Tuesday's Florida primary, Romney's campaign was not attempting to purchase television advertising time in any of the states on the Super Tuesday calendar.

Instead, the former Massachusetts governor's current plans call for campaigning in California and other primary states, said the officials, who had knowledge of the internal discussions. There would be organizational efforts primarily for caucus states.

Barack Obama has now cut the gap with Hillary Clinton to 6 percentage points among Democrats nationally in the Gallup Poll Daily tracking three-day average, and interviewing conducted Tuesday night shows the gap between the two candidates is within a few points. Obama's position has been strengthening on a day-by-day basis. As recently as Jan. 18-20, Clinton led Obama by 20 points. Today's Gallup Poll Daily tracking is based on interviews conducted Jan. 27-29, all after Obama's overwhelming victory in South Carolina on Saturday. Two out of the three nights interviewing were conducted after the high-visibility endorsement of Obama by Sen. Edward Kennedy and his niece Caroline Kennedy.

Clinton's lead in the three-day average is now 42% to Obama's 36%. John Edwards, who dropped out of the race Wednesday after Gallup conducted these interviews, ended his quest for the presidency with 12% support. Wednesday night's interviewing will reflect the distribution of the vote choice of former Edwards' supporters as well as the impact, if any, of Hillary Clinton's popular vote win in Florida on Tuesday.