Reaction to the death of former U.S. Sen. Arlen Specter of Pennsylvania, who died Sunday:

"He was a mentor, colleague and a political institution, and on a personal level, he was my first boss. Sen. Specter did more for the people of Pennsylvania over his more than 30 year career with the possible exception of Benjamin Franklin. He was a champion for veterans across our state and beyond, and will be deeply missed." - Gov. Ed Rendell, who served as an assistant prosecutor when Specter was Philadelphia's district attorney."Arlen Specter was always a fighter. From his days stamping out corruption as a prosecutor in Philadelphia to his three decades of service in the Senate, Arlen was fiercely independent - never putting party or ideology ahead of the people he was chosen to serve. He brought that same toughness and determination to his personal struggles, using his own story to inspire others." - President Barack Obama."He generated a lot of support and a lot of dissent, but he was unafraid to be held accountable. ... At the end of the day, he was one relentless, unapologetic fighter. Republicans and Democrats may not like how he voted, but they certainly had to respect his mindset." - Former Gov. Tom Ridge."Sen. Arlen Specter was a true Pennsylvania institution whose record of fighting for our Commonwealth is unmatched. Senator Specter's contributions to Pennsylvania and the United States will leave a lasting legacy." - Pennsylvania Democratic Party Chairman Jim Burn."A man of sharp intelligence and dogged determination, Sen. Specter dedicated his life to public service and the commonwealth of Pennsylvania. His impact on our state and public policy will not be forgotten." - U.S. Sen. Pat Toomey, R-Pa., who succeeded Specter."Arlen was a statesman and a problem solver who was able to work with Democrats and Republicans in the best interest of our Commonwealth and our Country. Arlen fought cancer courageously and his enduring legacy of support for the National Institutes of Health will help countless Americans as they battle cancer and other ailments." - U.S. Sen. Bob Casey, D-Pa."Today, Saundy and I join Pennsylvanians in mourning the loss of a dedicated public servant. Our thoughts and prayers are with Sen. Specter's family and friends at this difficult time." - Republican U.S. Senate hopeful Tom Smith, who is challenging Casey."He made tremendous and long-lived contributions to Pennsylvania and to our nation. He distinguished himself by leading on criminal justice issues, foreign affairs, and most especially, fighting for advances in health care research. Sen. Specter attacked problems and sought to find consensus for solutions. He cared deeply about his constituents and understood their concerns. He had a brilliant mind and required that those he entrusted be equally engaged in the issues he took on." - U.S. Rep. Patrick Meehan, R-Pa."Sen. Specter was a man of moderation; he was always passionate, but always easy to work with. I followed him through his previous illnesses, during the course of which he displayed great physical strength and great strength of character. Throughout his life, Sen. Specter fought and won many battles, but this was one he could not win. America is better today because of Arlen Specter." - Senate Majority Leader Harry Reid, D-Nev."A legendary figure in his beloved Pennsylvania, Arlen Specter brought his fierce intellect and a prosecutor's drive to countless battles in the Senate. He was a fighter to the end." - Senate Minority Leader Mitch McConnell, R-Ky.