Romney wins Conn., Del., R.I., Pa. Republican Presidential Candidate Mitt Romney greets supporters after speaking at a town hall meeting at Mustang Expediting in Chester, Pennsylvania on April 23, 2012. Mitt Romney bolted to Republican presidential primary wins in Connecticut, Delaware, Pennsylvania and Rhode Island Tuesday, election returns showed. The outcome in New York was still to be determined. In a victory speech he delivered while in Manchester, N.H., Romney made it clear his campaign is now against the Democratic incumbent, President Barack Obama. Thank you America. I can say with confidence and gratitude that you have given me a great honor and solemn responsibility and together we are going to win on Nov. 6," Romney said. The former Massachusetts governor, in advance remarks provided reporters, indicated his campaign will focus on showing voters he is the candidate best-suited to grow the United States' middle class, CNN reported. "I see an America with a growing middle class, with rising standards of living," Romney said in the prepared remarks. I see children even more successful than their parents -- some successful even beyond their wildest dreams -- and others congratulating them for their achievement, not attacking them for it. Romney went into the day's elections with an estimated 695 of the 1,144 delegates he needs to cinch the nomination. There were 224 delegates up for grabs in the five states Tuesday. It was the first primary day since Romney's closest challenger, Rick Santorum, announced he was leaving the race. Former House Speaker Newt Gingrich and U.S. Rep. Ron Paul of Texas are the other remaining major GOP candidates, but they trail badly in the delegate count. Delaware was the best chance the cash-strapped Gingrich had of picking up a win. He invested a lot of time campaigning to try to collect the state's 17 delegates. Gingrich is trying to add another state to his win column after picking up only his home state of Georgia and South Carolina. He needs five wins to appear on the Republican National Convention ballot in Tampa, Fla. Pennsylvania had 72 delegates at state, while New York had 95, Connecticut 28, Rhode Island 19 and Delaware 17. One pollster had said Romney should be prepared for a sympathy vote in Pennsylvania for Santorum, who represented the Keystone State in the U.S. Senate from 1995 to 2007, the Albany, N.Y., Times Union reported. But Romney was taking more than 50 percent of the vote in Pennsylvania, early returns showed.