Washington: US President Barack Obama is "unresponsive" to the will of the people and thus does not deserve a second term, Republican presidential candidate Mitt Romney said on Wednesday, asserting that the American economy under him would lead the world.

"This president has run out of ideas. He's run out of excuses. And in 2012, we're going to get him out of the out of the White House," Romney said in his speech in Boston.

Country's debts today are too high, the opportunities are too few.

"We have seen enough of this President over the last three years to know that we don't need another five of this president. That's for sure,” he said.

Romney alleged Obama seems to believe he's unchecked by the Constitution.

"He's unresponsive to the will of our people. He operates by command instead of by consensus. In a second term, he'd be unrestrained by the demands of re-election. And if there's one thing we cannot afford is four years of Barack Obama with no one to answer to," he said.

Romney said when he is the President; American economy will not be lagging behind.

"This American economy will be leading the world as it has and as it should and as it will do in the future," he said.

"I've got a pro-growth tax plan, jobs plan that's going to jump-start the economy. President Obama wants to raise your taxes; I'm going to cut them. That starts with an across- the board 20 percent rate cut for every American," he said.

Romney said his presidential campaign is about saving the soul of America.

"It is driven by an unshakable optimism that lies within the heart of every American citizen. We know that our future's brighter and better than these troubled times. We've been knocked down, we've been tested, but we don't accept that an America like this nation has limits. We know America is a land of opportunity. We still get up every morning and thank God that we're Americans," he said.

"It's time to believe in ourselves. It's time to believe in America. And I'm asking you to join our cause. We need your energy and your conviction and your commitment," he added.

"To the millions of Americans who look around and can only see jobs they can't get and bills that they can't pay, I have a message: You have not failed. You have a president that's failed you, and that's going to change," Romney said.