The collective shout of joy from political reporters around the Beltway is well deserved: Jon Meacham’s an editor once again.

The ex-Newsweek editor joins Random House as Executive Vice President and Executive Editor according to a press release published today via the AP. Mike Allen fleshed it out a bit more in his Playbook citing the new role will start in 2011. More important?

Washington now has a powerful new friend in New York publishing. Meacham will have a big checkbook and a huge appetite for great political books, but with high standard (will only take on three or so books a year, which means lots of retail attention to the authors he chooses to work with). A longtime observer of the New York/Washington literary world, when he heard the announcement: “Meacham just became arguably the most influential nonfiction editor in American letters.”

Meacham’s own catalog at Random House includes American Lion on the life of President Andrew Jackson, which also took the Pulitzer Prize.