WASHINGTON, D.C. -- The burning question in the U.S. presidential election is, when will the "your mama" jokes start?

With the fate of the world's most powerful country hanging in the balance, President Barack Obama and his Republican rival Mitt Romney turned to childish name calling on the campaign trail this week.

At a fundraiser in Connecticut on Monday, Obama blasted Romney's tax plan as a reversal of Robin Hood's theme of stealing from the rich and giving to the poor.

"He'd ask the middle class to pay more in taxes so that he could give another $250,000 tax cut to people making more than $3 million a year. It's like Robin Hood in reverse," Obama said, citing a report by the Tax Policy Institute that suggested Romney's plan would effectively raise taxes on middle-income earners.

"It's Romney Hood."

Zing!

On Tuesday, Romney fired back.

"We have been watching the president say a lot of things about me and my policies -- and they're just not right," Romney told Fox News. "And if I were to coin a term, it would be 'Obamaloney.'"

Pow!

Neither campaign denied Tuesday their next line of attack would include, "I know you are, but what am I?"
Other future attack ads could include "your mama" jokes, or remarks about how ugly the other candidate is.

There are 90 days to go before Americans head to the polls and decide which candidate is rubber and which one is glue.