During a campaign event in Urbandale, Iowa, Tuesday, Democratic gaffe-machine Joe Biden mistakenly asserted that Robert F. Kennedy and Martin Luther King Jr. were “assassinated in the ‘70s — late 70s.”

Both men, of course, were assassinated in 1968.

Making matters worse, the Dem frontrunner went on to suggest that women don’t know anything about the hippy subculture of the sixties, but he was happy to mansplain it to them.

“Up until that time — remember — none of you women would know this, but a couple of men may remember — that was a time in the early and late sixties and early sixties and sixties where it was ‘drop out. Go to Haight Ashbury, don’t get engaged, don’t trust anyone over 30,'” he stammered.

If you’re not sure what he was trying to convey there, join the club.

This blunder is just the latest in a series of embarrassing Biden blunders on the campaign trail that are giving Democrat activists heartburn.

During a stump speech in Iowa earlier this month, Biden also flubbed his standard campaign line, “we choose truth over lies,” saying instead, “we choose truth over facts.” Twice in one day, Biden claimed that while he was vice president, he had met with Parkland students following the mass shooting at Marjory Stoneman Douglas High School that left 17 dead. Of course, the shooting in Parkland, Fla., took place on February 14, 2018–over a year after he left the White House.

For some reason, Biden also keeps confusing long-dead Margaret Thatcher with more current female leaders like former British Prime Minister Theresa May and German Chancellor Angela Merkel.

Biden gaffed again at an Iowa campaign stop when he seemed to conflate “poor kids” with minority children, and proclaimed that they are “just as bright and talented” as the white kids.

He also recently confused the locations of the two most recent mass shootings in El Paso, Texas, and Dayton, Ohio, calling them “tragic events in Houston” and “in Michigan.”

Biden’s wife Jill made her best pitch for her husband at a campaign event in at Manchester, N.H. earlier Tuesday.

“I know that not all of you are committed to my husband. and I respect that. Your candidate may be better on — I don’t know — healthcare — than Joe is,” Biden said. “But you’ve got to look at who’s going to win this election. And maybe you have to swallow a little bit and say, okay, ‘I personally like so-and-so better, but your bottom line has to be that we have to beat Trump.'”