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His most difficult decision in office?

“The decision to surge our forces in Afghanistan,” Mr. Obama wrote. “Any time you send our brave men and women into battle, you know that not everyone will come home safely, and that necessarily weighs heavily on you.”

Asked what is the first thing he’ll do on the day after the election, win or lose, the president replied, “Win or lose, I’ll be thanking everybody who is working so hard — especially all the volunteers in field offices all across the country, and the amazing young people in our campaign offices.”

Many participants asked the president for the recipe for the beer brewed at the White House. Mr. Obama said of the beer: “It will be out soon! I can tell from firsthand experience, it is tasty.”

And asked whether he would make Internet freedom a plank in the Democratic Party’s platform, the president said yes.

“We will fight hard to make sure that the Internet remains the open forum for everybody,” he said.

The president also answered a question about what he’d do in a second term to limit the “corrupting influence” of money in campaigns, saying he favors a constitutional amendment to overturn the Supreme Court decision in the Citizens United case, which allowed corporations and unions to spend unlimited funds on advocacy.

“Over the longer term, I think we need to seriously consider mobilizing a constitutional amendment process to overturn Citizens United (assuming the Supreme Court doesn’t revisit it),” Mr. Obama said. “Even if the amendment process falls short, it can shine a spotlight of the super-PAC phenomenon and help apply pressure for change.”