@yokoono/Twitter

The Twitter account @BarackObama tonight retweeted Yoko Ono's picture of John Lennon"s bloody glasses from the day he was murdered.

The arresting photo, which includes text that more than a million people have been killed by guns since Lennon was shot in 1980, has been retweeted more than 11,000 times since it was posted Wednesday.

A retweet by the account associated with President Obama forwarded it to his more than 28 million followers. Retweets aren't always endorsements in Twitter etiquette, but Ono's activism comes at a time when President Obama and Democrats' push for more gun control after the Sandy Hook tragedy seems to be struggling.

A proposed assault weapons ban was stripped from a bill headed to the Senate floor. And that bill, which would universalize background checks, doesn't have the bipartisan support many backers would like.

Related: Ono Tweets Lennon's Bloody Glasses

Related: Senate Moves Democrats' Gun Control Bill