Marine One takes off Feb. 6 from the South Lawn of the White House (Mandel Ngan/AFP/Getty Images)

We kept hearing back in 2009 that Jake Sullivan, deputy chief of staff to former Secretary of State Hillary Clinton and before that on the Clinton primary campaign — was leaving after a couple years to return to his home state of Minnesota and run for office.

Sullivan, a Yale law graduate, Rhodes scholar, former Supreme Court clerk, second place in the 2000 world debating championship, did appear to be on his way out in 2011.

But Clinton offered him the job of heading State’s policy planning office (in the footsteps of foreign policy legends like George Kennan and Paul Nitze), so he remained in town.

Still, that was going to be for two years, just until Clinton left office, and then it was off to Minneapolis to practice law and run for office. For sure.

The White House announced Tuesday that Sullivan, 36, was Vice President Biden’s pick to be his national security adviser. Well, he better not stay in that job for long. He’s already five years older than Biden was when he became a senator.