"We are one nation, under God, indivisible," Biden shouted to the crowd. "We are all patriotic, we all love this country."
According to published reports, Palin told a North Carolina fundraiser Thursday that the best of America was not in Washington, D.C., but in small towns like the one in Alaska where she served as mayor.
"Being here with all of you hardworking, very patriotic, very pro-America areas of this great nation. This is where we find the kindness and the goodness and the courage of everyday Americans," the Republican vice presidential candidate said.
The Obama campaign issued a news release asking reporters what part of the country isn't pro-America.
While campaigning in New Mexico, Biden said Republican presidential nominee John McCain "has been bequeathed tactics of Karl Rove in the last few weeks" and warned that the final days of the campaign will get ugly.
Addressing a crowd of more than 2,000 in the Old Mesilla plaza, Biden urged supporters to ignore what they hear from McCain and concentrate on the change that the Democratic ticket promises. "You're going to see some really tough stuff," Biden said.
New Mexico has become a critical battleground state where Democrats see a real shot of making up the narrow gap that gave the state to President Bush in 2004.
Biden said fewer than 6,000 votes separated Bush and Massachusetts Sen. John Kerry in the last election, a gap that could easily be made up with a strong showing in early voting.
"Our job isn't going to be done until you cast your ballot," Biden said. "It's going to take all of us here today."