<p>Meghan McCain's trip on the book-promotion circuit brought her to "The Tonight Show" Tuesday," where she opened up a bit more about her relationship with former Alaska governor Sarah Palin.</p>
<p>McCain said she didn't find out her father had chosen Palin to fill out the 2008 Republican presidential ticket until a "couple of hours before" they appeared onstage together. She said she cried on the way to the rally.</p>