How many journalists have gone to work for the Obama administration?

From The Atlantic:

Time managing editor Rick Stengel is leaving journalism to go work for the State Department, making him at least the 15th reporter to go to work for the Obama administration. ...

A wave of reporters went to work for President Obama early in the administration, a time when many media organizations were going through layoffs and Obama's approval rating was sky-high. The flow has tapered off since then. The Washington Post's Ed O'Keefe has semi-regularly kept tabs on the number of reporters working for Obama administration, counting 10 in May 2009, 14 in 2010, and 13 in 2011. The Washington Examiner's Paul Beddard counted 19 reporters working for "Team Obama" in February 2012, but he included liberal advocacy groups as part of the "team."

@eScarry