Has there been a poll of Repubs only regarding Romney's tax returns?

Romney said the other day that a presidential candidate should be "disqualified" if he didn't get every tax loophole available to him. Do most Republicans agree with that viewpoint?

What do Republicans think of tax evasion? And putting money into Swiss bank accounts and the Cayman Islands? Wouldn't that seem like a good poll question to ask? Where are these pollsters?

I would be interested to know what Republican voters think about paying their "fair share" of taxes? I know many of them are anti-IRS so I would not be surprised with the responses.