Barack Obama's campaign has now responded to John McCain's choice of Alaska Gov. Sarah Palin as his running mate. A statement, attributed to Obama spokesman Bill Burton, reads:

Today, John McCain put the former mayor of a town of 9,000 with zero foreign policy experience a heartbeat away from the presidency. Governor Palin shares John McCain's commitment to overturning Roe v. Wade, the agenda of Big Oil and continuing George Bush's failed economic policies -- that's not the change we need, it's just more of the same.

Update: And here's a joint statement from Obama and Joe Biden:

We send our congratulations to Governor Sarah Palin and her family on her designation as the Republican nominee for Vice President. It is yet another encouraging sign that old barriers are falling in our politics. While we obviously have differences over how best to lead this country forward Governor Palin is an admirable person and will add a compelling new voice to this campaign.