3. Hillary Rodham Clinton’s commanding debate performance quelled talk of Joe Biden’s entry into the Democratic presidential race and dented Bernie Sanders’s vigor in some polls. New financial disclosures show that Mrs. Clinton is spending heavily to build the largest campaign infrastructure in either party. “I think these are very smart investments for them,” said a Democratic strategist. “But it is premised on one thing: that they can keep up the fund-raising pace.”

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Image Credit... Reuters

4. The nuclear agreement with Iran goes into effect today, requiring the country to begin dismantling much of its nuclear infrastructure. It is not certain how the arrangement will play out, given that the U.S. Congress remains hostile to the White House’s deal and that Iran has kept some details from its own lawmakers. Iran tested a missile and released photos underscoring its intent to increase its ballistic capacity.

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