Romney takes aim at Obama, Biden returns fire (CBS News) MILWAUKEE - Republican officials say more and more, it looks like Mitt Romney will be the party's presidential nominee. If Romney wins all of Tuesday's primaries, he'll be more than halfway to the number of delegates needed to clinch the GOP nod. President Obama and his re-election campaign are ready for that. In a "Face the Nation" interview Sunday, Vice President Biden used one three-word phrase repeatedly to attack the Republican front-runner -- "out of touch.." Full CBSNews.com coverage: Election 2012 "I think (former Massachusetts) Gov. Romney's a little out of touch," Biden said. "I think it's totally out of touch with reality," he said at another point. "I find that just totally out of touch with what most Americans think about American jobs," Biden remarked in another answer. "I can't remember a presidential candidate in the recent past who seems not to understand, by what he says, what ordinary middle class people are thinking about and concerned about," Biden also said. Romney is starting to act more like the nominee as he campaigns in Wisconsin, where Tuesday's most important primary is being held. A string of endorsements from the GOP establishment and rising numbers in the polls left Romney a bit more lighthearted on the campaign trail this weekend. Is that what you call yourselves here? Wisconsinites?" he asked at one stop. " ... How about someone from Massachusetts? Romney laughed when someone in that crowd shouted out, "President!" All kidding aside, Romney, sounding more confident than ever, ignored his Republican rivals and attacked Mr. Obama. "This president can't run on his record," Romney said. And so, he's going to try in every way he can to divert to some other kind of attack and try and have people disqualify our nominee, which will probably be me. On "Face the Nation," Biden asked, "What is the Romney answer? Get rid of that. ... Meanwhile, growing numbers of Republicans are calling on former Penn. Sen. Rick Santorum to drop out of the race for the good of the party. Santorum pointed to Romney's actions as reason to stay in. "Why," he asked, "is he spending $4 million in Wisconsin if the race is over? Why is he bothering even campaigning anymore if it's over? Newt Gingrich who's only won two contests, acknowledged over the weekend that Romney's the likely nominee, but Gingrich said he's going to make Romney work for it.