It might be more accurate to say that rubber-stamping mergers maxed-out under the Obama DoJ.
Comcast - NBCUniversal (2011)
AT&T - T-Mobile (2011)
Express Scripts - Medco Health Solutions (2012)
Google - Motorola Mobility (2012)
Anheuser-Busch InBev - Grupo Modelo (2013)
US Airways - American Airlines (2013)
Oracle - Sun Microsystems (2010)
Comcast - Time Warner Cable (2014)
Heinz - Kraft Foods (2015)
AT&T - DirecTV (2015)
Administrations before and after were almost-but-maybe-a-tiny-bit-less eager to approve competition+job killing mergers.What DoJs were not eager to do was push back against pressure from Elected Congresspeople who 1) held DoJ purse strings and 2) had elections that needed funding.