According to the International Herald-Tribune, junior Illinois Democratic Party Senator Barack Obama said:

“I think you reserve impeachment for grave, grave breeches, and intentional breeches of the president’s authority,” [and,] “I believe if we began impeachment proceedings we will be engulfed in more of the politics that has made Washington dysfunction,” he added. “We would once again, rather than attending to the people’s business, be engaged in a tit-for-tat, back-and-forth, nonstop circus.”

One notable reaction (reminiscent of the reaction Vice President Cheney received in New Orleans shortly after hurricane Katrina hit) is found on digg.com:

“Well, fuck you then, Obama.”