COLUMBUS , Ohio ( CNN ) -- The Web site of the Ohio secretary of state was back up and running Tuesday , a day after officials pulled the site partially offline when it was hacked by unknown outsiders . Ohio Secretary of State Jennifer Brunner says her office has received death threats . Secretary of State Jennifer Brunner told CNN that `` fortunately '' no sensitive material was breached in the incident . `` We found it in time that we were able to mitigate any problems , '' she said . However , Brunner said it was n't the first time her office , which has been embroiled in an ongoing dispute with the state Republican Party over alleged voter registration fraud , has been targeted and that death threats have been part of the package . `` There 's been a concerted effort to barrage the office with e-mails and phone calls , '' she said , `` not just to our elections division but to business services division . My employees have been real troopers here . `` The First Amendment is alive and well in the United States , and you know that , and they 're not coming just from Ohio . A lot of times , they 're coming from other states . But this is all part of the process . And my employees are doing a fantastic job of staying focused on what they need to do . '' Brunner said the Ohio Highway Patrol is investigating the hack , the calls and e-mails , as well as a suspicious package with a message that said `` Death to Obama supporters '' and an unidentified powder . That package , addressed to an old office building , was delivered by her office by mail last week , she said . The secretary attributed the troubles to the `` contentious nature '' of the litigation begun by the Ohio Republican Party . Last week , the U.S. Supreme Court blocked a lower court order directing Brunner -- a Democrat -- to update the state 's voter registration database after information provided by some newly registered voters did not match up with Social Security and driver registration numbers . The state Republican Party had asked for enforcement of a temporary restraining order , but the justices , in an unsigned order , denied that request . Brunner and other elections officials had appealed an earlier ruling from the 6th U.S . Circuit Court of Appeals in Cincinnati siding with the state GOP . The state Republican Party contends that there is widespread voter fraud in Ohio , considered by many to be a crucial battleground state for the 2008 presidential election . Officials also allege Brunner `` turned off '' its process for verifying voter registrations while allowing Ohioans to cast ballots on the same day they registered . State GOP Chairman Bob Bennett has accused Brunner of concealing fraudulent voter registrations in hopes of swinging the state to Sen. Barack Obama , the Democratic presidential candidate . Voter registration fraud involves submitting registration forms for people not eligible to vote , and rarely turns into the more serious crime of voter fraud , in which people knowingly vote illegally in an attempt to defraud the election system . Most voter registration fraud cases involve registrars , hired by non-profit organizations to register people to vote , who submit forms they filled out themselves rather than collected from actual potential voters , according to the Brennan Center for Justice . Cases of actual voter fraud are themselves extremely rare , the center said . Republican Party officials are challenging voter registration in several swing states in this election cycle , prompting charges from some Democrats that the GOP is attempting to suppress the Democratic vote . Similar charges were leveled in 2004 when George W. Bush narrowly defeated John Kerry in Ohio to secure a second term , but the Department of Justice failed to uncover any evidence of intentional vote suppression . CNN 's Mary Snow contributed to this report .
Hackers attack Ohio secretary of state 's Web site . Secretary of State Jennifer Brunner says office has received death threats . Supreme Court recently backed secretary of state in voter registration dispute . Ohio Democratic Party contends widespread voter fraud in Ohio .