A long period of silence or confused babble in response to a simple question. Done to allow the person to come up with some kind of desperate, plausible response.
Denoting that the Republican presidential candidate has no clue how to answer the question except to use one of the Republican's stock phrases like "President Obama did it wrong." Also known as brain fart, senior moment, Santorum Stumble, Michele Melt-down, Gingrich Gaffe, Mitt Muddle, a Rick Rest-period, etc.
When the Herminator got asked about his possible inappropriate sexual behavior with former female staffers in the National restaurant Association, he got really quiet for a long time. Then he said, "I thought they wanted me to hold the pepperoni!" Later he called that a "powerful pause."