Watch the Republican candidate's appearance on
The Daily Show
"I know my endorsement has just made your mind," he quips
PLUS:
Jen Aniston heats up with
John Mayer -- and more!
On
Letterman, the candidate also jokes about
Paula Abdul
"It's not interesting [to them]," he tells
Rachael Ray
"He's a good man," her beau,
Joel Madden, tells
Us of the presidential hopeful
They appeared on Thursday's
Colbert Report
"It’s time for change,"
The Hills star says
The candidates' spouses pen personal appeals for your support
The child actor is an "avid supporter" of Obama
