President Obama and his family were there. President George W. Bush and his wife Laura attended. But missing from the 50th anniversary of the Bloody Sunday march in Selma, Alabama? President Bill Clinton and his wife, Hillary Clinton, as well as Jimmy Carter and George H.W. Bush.

All former presidents were invited to the anniversary, according to news reports.

The Clintons, however, were in Miami for a Clinton Global Initiative event. As local10.com reported:

As Democrats worry about Hillary Clinton's hash tag "e-mail ghazi" scandal affecting her 2016 election prospects, she is visiting Miami-Dade's Coral Gables neighborhood for the weekend. President Bill Clinton and their daughter, Chelsea Clinton, were at the University of Miami, meeting with about 1,000 student leaders nationwide participating in the Clinton Global Initiative.

It's unclear why Carter and George H.W. Bush were unable to make the event. In all, about 40,000 people made it out for today's anniversary.

But former President Bill Clinton did tweet about the event.

50 years ago, a single day in Selma became a profoundly important moment in our history. #Selma50 #MarchOn https://t.co/W48pzynVlu

— Bill Clinton (@BillClinton)
March 7, 2015

And he shared this video, posted on the YouTube account of the Bill, Hillary, and Chelsea Clinton Foundation:

The absence of the Clintons was noticed on Twitter:

Powerful speech by Obama. Question: I read 100 pieces re Boehner not attending. How about Clintons. Don't see them. Are they there? #Selma50

— Ana Navarro (@ananavarro)
March 7, 2015

@ananavarro Bill must be held captive in a basement somewhere. Like you I can't believe he missed it.

— Matthew Cooper (@mattizcoop)
March 7, 2015