WASHINGTON: Campaigning in support of the incumbent Barack Obama, the former US President Bill Clinton accused Republican presidential nominee Mitt Romney of concealing truth about raising taxes for the middle class.

During an election rally in the battleground state of Ohio, the charismatic Democratic leader alleged that Romney is hiding the fact that he would have to raise middle class taxes to pay for his USD 5 trillion tax cuts favoring the wealthiest Americans.

He also accused of hiding his tax returns, as well as hiding whether he opposed the Lilly Ledbetter Fair Pay Act, which helps women fight back when they don't get equal pay for equal work.

His charges, however, were denied by the Romney campaign. "I listened very carefully to the Vice Presidential debate and to the second Presidential debate, and Romney says, I'm going to do all of this, I'm going to just cut taxes for the middle class, I'm not interested in rich people, they'll pay the same percentage of tax they pay now.What does that mean? He thinks we're dumb," Clinton said.

"He's hiding everything. He doesn't want you to think about him. He wants you to think, oh this economy is terrible. "I'm a jobs guy." And as President Obama said in the debate, if I brought you a deal to Bain Capital and I said, fund my new business, I'll give you the budget sometime in the future, just trust me on that - you wouldn't give me one red cent, and we should not give him one vote on that," he said.

However, the Romney Campaign senior advisor Danny Diaz said that it was becoming increasingly clear that Obama's campaign which is devoid of a record to run on or any plan for a second term, is growing desperate.

"This election will determine our direction over the next four years, and Americans have a clear choice. They won't be distracted by the Obama campaign's reckless and unfounded attacks," Diaz said.

Over the next three weeks, Mitt Romney and Paul Ryan will continue to communicate their plan to create 12 million new jobs with rising take-home pay and get the economy growing again.

The Obama Campaign spokesman, Danny Kanner, said in Ohio Clinton powerfully articulated the progress the US is making under Obama.

"We have created 5.2 million private sector jobs over the last 31 months, the unemployment rate is at its lowest level since January 2009, consumer confidence is at a five year-high, and foreclosures are at a five-year low," he said.

"Since Romney and Ryan's tax plan would raise taxes on the middle class to pay for tax cuts for the wealthiest and independent economists agree their jobs 'plan' wouldn't create jobs, they're forced to attack what the President has said repeatedly: we have more work to do," he said.

"But, as President Clinton noted, we simply can't afford to go back to the same failed policies that brought our economy to the brink of collapse in the first place - and that's exactly what Mitt Romney's offering," Kanner added.