ABC News' Matthew Jaffe reports: While Republicans congregate in the Twin Cities striving to keep their hold on the White House, Barack Obama's running mate Sen. Joe Biden, D-Del., sharply criticized the Bush administration Tuesday while delineating the changes Democrats would demand if they rise to power."In an Obama-Biden administration, we will not have an attorney general who blatantly breaks the law," Biden said at a town-hall meeting in West Palm Beach, Florida, his voice at times drowned out by applause. "We will not have a president who doesn't understand the Constitution. And I will not be a vice-president who thinks he's not part of any of the three branches of government." Biden ripped the Bush administration for wasting a chance to unite the nation in the aftermath of the September 11 terrorist attacks. "George Bush and his administration are going to be judged harshly by history," said the Delaware lawmaker. "Not for the mistakes they made, but for the opportunities to unite America and the world they squandered." Now, Biden said, he and Obama are determined to take control of the West Wing, noting that he would not have agreed to share the Democratic ticket had he not known Obama's commitment to sticking to his values. "Have you figured out what is worth losing over?" he said. "Because if you have not, it's just raw ambition. Barack understands what is worth losing over." The McCain campaign responded to Biden's comments by using the veep nominee's own words against him. McCain's team referred back to when Biden, while campaigning in the Democratic primary, said that Obama was "not ready" for the presidency."Six months ago Joe Biden's description of an Obama administration was littered with questions of inexperience," said McCain spokesman Ben Porritt. "Today, Biden has been tasked with carrying the water for Barack Obama who has voted in favor of taxes 94 times in three years and has claimed that making decisions on the tough issues is 'above his paygrade'. Barack Obama has zero foreign policy experience, is not a credible voice on U.S. relations abroad, and as John McCain and Joe Biden agree, is just not ready to lead."Earlier Monday, addressing a crowd in Deerfield Beach, Florida, Biden also preached the importance of this election in terms of the Supreme Court, noting that the next administration might appoint as many as three new justices. "The single most important domestic decision that a president gets to make on his own or her own is the Supreme Court," he said. Looking to the future but with one eye on the past, Biden also promised that an Obama-Biden government would go through Bush administration data with "a fine-toothed comb" and pursue criminal charges if necessary. "If there has been a basis upon which you can pursue someone for a criminal violation," he said, "they will be pursued, not out of vengeance, not out of retribution - out of the need to preserve the notion that no one, no one, no attorney general, no president, no one is above the law." On Tuesday, the vice presidential nominee continued his 48-hour swing through the Sunshine State with stops in Ft. Myers and Sarasota.