In the run-up to Monday’s Iowa caucuses, White House hopeful Hillary Clinton has a lead of just three percentage points according to an influential last-minute poll.<br /><br /> The Des Moines Register/Bloomberg Politics Iowa poll released on Saturday indicated a tight Democratic and Republican race.<br /><br /> Democrat Clinton was only just ahead of self-declared socialist Senator Bernie Sanders of Vermont, at 45 percent to 42 percent.<br /><br /> But the row over the former Secretary of State’s use of an unsecured home server for e-mails, some of which the State Department deems too ‘top secret’ to disclose, just won’t go away.<br /><br /> Clinton continues to defend herself against claims that she made highly sensitive government secrets vulnerable to attackers. <br /><br /> “I don’t know which ones they have plucked out to fail to disclose and we have called for all of them to be released. This doesn’t change anything about the fundamental facts. I never sent or received any e-mail marked classified. I take classified information
