Final answer:
Speaker 1, expressing that while the president's behavior is untrustworthy, it does not affect his governance, most clearly articulates a liberal point of view on Bill Clinton's impeachment.
Step-by-step explanation:
The speaker who most clearly states a liberal point of view on the impeachment of Bill Clinton is Speaker 1. This speaker recognizes the president's behavior as untrustworthy but does not believe it affects his ability to govern, which aligns with the views of many House Democrats at the time. They argued that Clinton's actions fell short of an impeachable offense, considering a censure instead of removal from office.