Vicki Cowart said the organization would “square our shoulders” and carry on with its mission.
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The president and his daughters went to Upshur Street Books in the Petworth area.
The order came hours after Turkish president Recep Tayyip Erdogan voiced regret over the incident for the first time.
Election results were due Dec. 1, with more than 100,000 Native Hawaiians eligible to vote.
"Our national epidemic of gun violence must be addressed."
The strike came eight days after 20 people were killed in an attack on a luxury hotel in Bamako.
CJ Pearson says GOP does not do enough for racial and gender issues.
The 44-year-old Garrett Swasey was among the three killed in Friday's violence.
“This is not normal. We can’t let it become normal,” he added.
A gunman engaged in a standoff with police for five hours on Friday.