We talked this morning about revelations that Sen. Marco Rubio’s (R-Fla.) family history, one of the keys to his political identity, is not what he says it is. For years, the right-wing senator insisted that his parents fled Castro’s Cuba, but documents now show Rubio’s mother and father left the island in 1956, years before Castro’s takeover.

Throughout the day, the senator’s office has been engaged in some pretty aggressive pushback, publishing a piece in Politico, circulating a Miami Herald article in which he recently told his parents’ story accurately, and generally putting a spin on the word “exile.” (Under Rubio’s definition, his parents may not have been exiles when they left Cuba for the U.S., but since they hoped to return to Cuba eventually, and couldn’t because of Castro, this eventually turned them into after-the-fact exiles, which means he technically was telling the truth.)

But for all of his righteous indignation, Rubio’s personal bio still includes this claim:

In 1971, Marco was born in Miami to Cuban-born parents who came to America following Fidel Castro’s takeover.

That’s just not true. 1956 does not “follow” 1959.

It’d be easy for the senator and his office to fix this. When Sen. Scott Brown (R-Mass.) got caught plagiarizing on his website, the senator blamed it on a staff error and took down the content. Notice, however, that Marco Rubio refuses to do back down — perhaps the senator feels as if correcting the falsehood would be tantamount to admitting he’s wrong. But he is wrong.

Rubio said in a statement that the “essential facts of my family’s story are completely accurate.” If so, why does Rubio’s bio, more than 24 hours after the truth came to light, still include this transparent falsehood?

The senator, even now, is saying his parents came to the United States following Fidel Castro’s takeover. We know — he knows — that’s just not what happened. If the rest of the story can spun and/or parsed, why not correct the falsehood and move on?

For what it’s worth, American Bridge seized on this earlier today, producing a video highlighting some of the instances in which Rubio repeated a story that doesn’t stand up well to scrutiny.

Steve Benen

Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.