Nick Clegg interview on leaders debate

The transcript discusses the chaotic nature of political debates, especially among multiple politicians, and the importance of maintaining discipline. It reflects on the impact of past debates on election outcomes, noting that despite perceived victories, they may not always translate into electoral success. The discussion also touches on how debates can lead to significant political changes, using the example of the Liberal Democrats.

What does the speaker mean by 'keeping on the straight and narrow'?

What is implied about the Liberal Democrats in the context of the debates?