I've tried to find links and possible videos but could not. To my recollection Pelosi and Becerra both used the term on Sunday news shows they appeared on.
In the OP you said you heard them make these comments. If so, then it might be possible to simplify the search a little.
1. Do you remember which Sunday it was you heard the comment? Write the date down. (I'm guessing it was July 1.)
2. What Sunday news shows did you listen to on that Sunday? (Make a list of these.)
3. Go to the web sites for these programs and check the guest lists for these shows on that date. Which one(s) did Pelosi and Becarra appear on?
4. When you've located the shows you watched which had Pelosi and Becarra as guests, check the site for these shows to see if a transcript is available.
That's if you actually heard the comment yourself, as opposed to hearing someone else such as Rush Limbaugh describing the comment or playing back an excerpt of the comment. If you didn't actually hear the comment being made, but heard instead an edited version from someone like Limbaugh, you should still be able to find the original:
1. Do you recall the opinion program on which you heard the edited excerpt?
2. If so, and if it's a national program such as Limbaugh's, go to the program's site and do a search for "Nancy Pelosi", "Xavier Becarra", or "free riders". (Of these, Xavier Becarra is probably the best item to search for. She's not that common a topic of discussion, so if you get a hit for her it's likely to be about this.)
3. Look up the transcript. Does it tell where the program host found the item? If so, you now know where to go to look for item so that you can hear it for yourself, in full and in context.
[It's quite likely the source for the Pelosi comment is
Meet The Press, July 1 2012.]