SPRINGFIELD, Missouri, (Agencies) - White House rivals Barack Obama and John McCain Sunday hurled themselves into a Herculean final 48 hours of campaigning before their date with destiny in the historic US election being held on Tuesday (tomorrow). Obama and the Democrats hold a commanding position two days before Tuesday's election, with the senator from Illinois leading in states whose electoral votes total nearly 300 and with his party counting on significantly expanded majorities in the House and Senate. McCain is running in one of the worst environments ever for a Republican presidential nominee. The senator from Arizona has not been in front in any of the 159 national polls conducted over the past six weeks. His slender hopes for winning the White House now depend on picking up a major Democratic stronghold or fighting off Obama's raids on most of the five states President Bush won four years ago that now lean toward the Democrat. He also must hold onto six other states that Bush won in 2004 but are considered too close to call. In its latest national tracking poll Sunday, Zogby International had Obama on 49.5 per cent to McCain's 43.8 per cent. A Washington Post-ABC News poll gave Obama a 53-44 per cent lead. The latest Rasmussen daily poll showed Obama leading with 51 per cent of the vote with McCain five points back on 46 per cent. McCain's campaign manager Rick Davis however said the polls were skewing the true perception of the race. "There is no doubt that John McCain is increasing his margins in almost every state in the country right now and I think what we're in for is a slam-bang finish," he said on Fox News Sunday. "I mean, it's going to be wild. Obama's wife Michelle joined her husband Sunday in exhorting more than 60,000 supporters in Columbus, Ohio, to remake the nation as the would-be first family put on a loving tableau two days from election day. After being introduced by Michelle with their two young daughters in tow, the presidential hopeful said: "We are two days away from changing America, and it's going to start right here in the great state of Ohio." The Illinois senator bidding to become America's first black president again hammered Republican John McCain on the stricken US economy and said his policies would extend the broken legacy of President George W. Bush. "In two days, at this defining moment in history, you can give this country the change we need," Obama told a crowd in front of the Columbus state house that city police said numbered over 60,000. Michelle Obama rejoined her husband on the campaign trail with their girls in Colorado and Missouri Sunday, triggering flattering photographs across newspaper front-pages of the putative first family. She told the rally in the must-win state of Ohio that the campaign had been an "amazing journey," as young and old found a voice in politics for the first time. But the race was not about Barack Obama. John McCain, following his own two-day bus odyssey around the rust-belt state, was stepping up the pace with his first midnight rally of the campaign, in Florida, following events in Pennsylvania and New Hampshire. "My friends - the Mac is Back," he roared in Pennsylvania, a state where polls favour Obama, but which the Republican needs to turn to have any chance of getting the 270 electoral votes needed for victory. The fired-up 72-year-old Arizona senator, who is trailing Obama in national and battleground polls, renewed his attacks on his opponent's patriotism and tax plans. "I've been in a lot of campaigns, I know when momentum is there. We're going to win Pennsylvania, we're going to win this election," McCain said. "We've got two days, knock on doors, with your help we can win. We need you to volunteer, we need a new direction and we have to fight for it." The presidential campaign has narrowed down to states that have been reliably Republican in recent elections, or in the case of Virginia, Indiana and North Carolina, that have not voted for a Democratic hopeful in decades. Flush with a record-breaking fundraising operation, Obama is on the offensive all across the map. He campaigned Saturday in Nevada, Colorado and Missouri as he bid to lock down Republican states in the west and midwest. Among McCain's targets Sunday was New Hampshire, which took him to its heart when he ran for the Republican nomination against Bush in 2000. But Obama leads there, as well as in Pennsylvania, Florida and Ohio. Obama had his own star power in the works with rocker Bruce Springsteen due to perform at one of his three rallies in Ohio, in Cleveland early Sunday evening. McCain was to wrap up his campaign with a multi-state, whistlestop tour Monday. For his own campaign climax Monday, Obama was heading on a battleground blitz of Florida, North Carolina and Virginia. He was then to return to Chicago, to see if his unlikely bet with the American people has paid off.