soheil1 The mother of one of the Sandy Hook school shooting victims stepped in for President Obama to deliver the White House weekly address It means that she read the weekly White House address instead of the President, who usually (reads)(delivers) it. step in for = take the place of
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soheil1The mother of one of the Sandy Hook school shooting victims stepped in for President Obama to deliver the White House weekly addressIt means that she read the weekly White House address instead of the President, who usually (reads)(delivers) it.