That makes no sense whatsoever, unless you think that Monica gate somehow impacted Al Gore's inability to campaign very well.
I thought 2000 was the fault of Ralph Nader/Supreme Court/Florida Secretary of State. This is the first time I have heard it blamed on Monica.
Well this is all hypothetical, but it is interesting (to me if no one else).
Having said that...
Clinton was the sitting President, working with a budget surplus, and 23 million jobs created over his two terms in office.
Al Gore didn't use Bill Clinton to stump for him in 2000 because of the sexual scandal.
Just look at the enthusiasm Bill Clinton generated at the DNC this year and in Ohio following Sandy.
Are you telling me he couldn't have generated a few hundred votes in Florida for Al?
Regardless of the sexual scandal, not using Bill Clinton might have been Al Gore's biggest mistake.