These are all the final speeches I could find that were given by the presidential candidates following the results of the 2008 Iowa Caucuses.

Democrats’ Iowa Caucus Speeches

Barack Obama’s Iowa Caucus Victory Speech

John Edwards’ Iowa Caucus Speech

Hillary Clinton’s Iowa Caucus Speech

Joe Biden’s Iowa Caucus Concession Speech

Republicans’ Iowa Caucus Speeches

Mike Huckabee’s Iowa Caucus Victory Speech

Mitt Romney’s Iowa Caucus Speech