Former Massachusetts Gov. Mitt RomneyWillard (Mitt) Mitt RomneyDems flip Wisconsin state Senate seat Ex-adviser thinks Romney will run for Senate Jeb Bush backs Romney for Utah Senate run MORE's (R) presidential campaign released this video Sunday of Sen. John McCainJohn Sidney McCainMcCain rips Trump for attacks on press NSA spying program overcomes key Senate hurdle Meghan McCain says her father regrets opposition to MLK Day MORE (R-Ariz.) campaigning for Romney in the 2002 Massachusetts gubernatorial race.

McCain, introducing Romney at a 2002 campaign event, says Romney is a man of "unimpeachable integrity," that he is proud to be in Romney's company, and that he is committed to Romney's race. McCain's comments draw applause and laughter from Romney's supporters.