John McCain and 19% didn't answer the question, according to Mark Hugo Lopez, associate director of the Pew Hispanic Center.

CNN: Casting ballots on both sides of the U.S.-Mexico border

As superb as Nadal has been since returning from a seven-month injury layoff, his clay-court season hasn't been perfect and his knee remains a question mark.

WSJ: Roland Garros: Return of the French Resistance

Indeed, there was a question mark over why the Bannsiders hadn't been awarded a penalty for Murphy's moment of madness.

BBC: Crusaders 2-0 Coleraine

To go back to Mark's question, we haven't been here for a year wondering what it is we were here to do.

WHITEHOUSE: Press Briefing

He reckoned that if he wasn't around any more, there'd always been a question mark over his guilt, which would be good for his children.

BBC: Lucan 'committed suicide'

"It leaves a question mark over this race, and we won't have the final answer until the votes are counted, " said David Gergen, a senior political analyst for CNN.

CNN: Will Obama suffer from the 'Bradley effect'?

Another question mark: The U.S., which hasn't joined the Kyoto Protocol limiting greenhouse gases, is still trying to figure out how it wants to control carbon emissions.

FORBES: Selling the Blue Sky

Some would even argue that Guardiola was less an innovator than a custodian in charge of making sure his club didn't waste its ample talent, though that might be taking it too far. (He couldn't be reached for comment to answer the question.) Certainly, Guardiola put his mark on the club.

WSJ: Pep Guardiola: The World's Most Coveted Coach

"It's a black mark and a sad day and calls into question, if the comptroller can't police his own campaign operation, how effective is his oversight of taxpayer dollars, " said Dick Dadey, executive director of Citizens Union, a civic group.

WSJ: Guilty Verdicts in Liu Trial