[Bernard Marx]

Or how much john kerry can your john carry?

How about this? Despite all Ter-Ay-Zuh’s wild gushing About Edwards’ and Kerry’s hair-brushing, In the cold light of day All one needs to say Is they’re just two full Johns that need flushing

[weegee]

(formatting helps keep the rhyme...)

Despite all Ter-Ay-Zuh’s wild gushing
About Edwards’ and Kerry’s hair-brushing,
In the cold light of day
All one needs to say
Is they’re just two full Johns that need flushing

The beat pattern I found online was:

da da DUM da da DUM da da DUM
da da DUM da da DUM da da DUM
da da DUM da da DUM
da da DUM da da DUM
da da DUM da da DUM da da DUM

Just to use your limerick as an example, here is the same rhyme with just a few minor changes:

Despite all Ter-Ay-Zuh’s wild gushing
About Kerry/Edwards’ hair-brushing,
In the cold light of day,
All that one needs to say,
Is they’re two full Johns that need flushing!

[FITZ]

Good one --- two johns that need flushing.