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Dick Cheney is certainly not one to hold back on how he really feels. George W. Bush, on the other hand, has been mum.

Despite their differing approaches to handling the post-White House years, their absence on the campaign trail has been obvious.

"The former president has been very quiet since leaving the White House in 2008, other than appearances related to fundraising and the establishment of his presidential library," said political analyst Bill Crane. "The vice president has primarily been visible on issues such as national defense and has traditionally not been the strongest fundraising draw."

Cheney also has been dealing with health troubles -- undergoing heart surgery in July and spending the bulk of his time since then recovering.

But that is not stopping him. The 69-year-old soon will embark on a 10-stop speaking tour this year, with additional plans next year when his memoirs are slated to come out.

While conservatives adore the former vice president, they understand that he is a polarizing figure, especially to independents, a vital voting bloc in any election.

"Conservatives would love to see Dick Cheney be more vocal," said S.E. Cupp, a conservative blogger and co-author of the book "Why You're Wrong about the Right." "But at the same time, he's not an idiot and neither are conservatives. He realizes that while that might energize the conservative base, that might not win over many independents who have a very bitter taste in their mouth from the Bush administration."

And it shows in the polls.

A USA Today/Gallup Poll in early September found that 71 percent said Bush should get blame for the country's economic troubles. A CNN/Opinion Research Corp. poll taken at the same time indicated that 53 percent blamed Bush and Republicans for causing the current economic conditions, while 33 percent blamed President Obama and Democrats.

Those numbers may be why Tea Party-backed candidates such as Republican Sharron Angle and Ken Buck have made a name for themselves and are neck and neck in the polls against their Democratic opponents. They tout themselves as outside the Washington fray.

Washington insiders such as House Minority Leader John Boehner and Republican National Committee Chairman Michael Steele are likely seen as a part of the problem to voters disenchanted with Washington.

"There's a reason why so many of these conservative candidates are not going to John Boehner to help them to campaign," Cupp said. "They kind of want to do it on their own to have at least an appearance of being grass-roots and unaffiliated."

Conducted June 19-22 of 1,100 likely voters, the poll found that Bush's economic principles are "almost universally rejected" by a large margin -- and merely bringing up the former president's name causes a swing in attitudes.

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Many moderate Democrats in hard-fought battles this year are putting out the welcome mat for another one: Bill Clinton.

He has stumped in conservative areas for Blue Dog Democrats and is a real asset for Democrats across the board, Siegel said.

"Bill Clinton is not governing now. And when you think back to his presidency, at least economically, you think about a booming economy and surpluses, fiscally responsible," he said. "I could see how he would be a tremendous plus. Bubba in the South -- very, very popular culturally ...

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