From a July 2 Washington Times article, headlined “Democrats' supermajority may be illusory”:

“The problem Democrats will run into now is that they can no longer blame 'obstruction' by Republicans for delaying their agenda,” one senior Republican aide said. “There's nothing stopping them from moving anything they want, as long as they're all willing to accept responsibility for the consequences of passing a national energy tax, government takeover of health care, more bailouts and running the auto industry.”

From NRSC chairman John Cornyn's (R-TX) June 30 statement on Senator-elect Al Franken's (D-MN) election victory:

The implications of this Senate race are particularly significant because the Democrats will now have 60 votes in the Senate. With their supermajority, the era of excuses and finger-pointing is now over. With just 59 votes, Senate Democrats in recent months have passed trillion-dollar spending bills, driven up America's debt, made every American taxpayer a shareholder in the auto industry and now want Washington to takeover America's health care system. It's troubling to think about what they might now accomplish with 60 votes.