The president is also expected to meet with grieving families during his Boston trip.
"Instead of supporting this compromise, the gun lobby and its allies willfully lied about the bill," said Obama about the Senate defeat.
The letter tested positive for ricin, a deadly poison.
Organzing for Action wants you to call and tweet your senators as they prepare to vote on gun control measures today.
"We will find out who did this, and we will hold them accountable," said President Obama.
As the Senate prepares to vote on the measures, the White House is asking you to share your support.
President Obama confirms authorities are looking into the recent hacking of first lady Michelle Obama and other public officials and celebrities.
Last night, President Obama touched on a number of important topics for the nation. Which moved you most?
"I'm going to be talking about making sure that we're focused on job creation here in the United States of America," said the president.
Given the countless inauguration balls, galas, happy hours, club events and afterparties that took place over the weekend, it’s easy to assume that nothing of substance occurred. That assumption would be wrong.
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#hihihi Me with the talented young @tylenjwil instantmomtv See you next season baby. http://t.co/3NP8RtjlhR
In the words of my mother, "you have to see @blairwmiller to understand." #handsomeman http://t.co/S9P0wsMr0s
Today let your breath be your soundtrack. Smile and breathe in every pose.
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