President Joe Biden told CBS News he has plans to campaign on behalf of Vice President Kamala Harris, notably in swing-state Pennsylvania.CBS News Sunday MorningBiden addressed questions regarding his health following his exit from the 2024 race.The president told CBS News he had "no serious problem" and was just sick during the June debate.Biden said he was ready to join the campaign trail to stump for Vice President Harris' campaign.In an interview that aired Sunday, President Joe Biden rebuffed speculation over his health and said he was ready to stump for Vice President Kamala Harris.Biden, who stepped aside as the Democratic presidential nominee last month after a poor debate performance in June, touched on his condition while laying out his plans to aid Harris' presidential campaign."I had a really, really bad day in that debate because I was sick, but I have no serious problem," Biden told CBS News on Sunday.Biden then pivoted to Harris' race, noting that he looked forward to stumping for the vice president in Pennsylvania, a critical battleground state for both Harris and former President Donald Trump."I was talking to Governor [Josh] Shapiro, who's a friend.