Obama on Gore

Senator Obama talks to CBS News about the prospect of former veep Al Gore squeezing into an already crowded race.

"Barack Obama concedes that Al Gore entering the presidential race would seriously alter the political landscape.

The Illinois senator told The Early Show national correspondent Tracy Smith that the former vice president would be an "extraordinarily formidable" candidate if he were to join the Democratic fray, adding, "He would have as good a resume as anyone in the field, better — uh — than anybody in the field."