The following message was observed just 49 seconds after mongod started:

Sat Jul 14 15:49:09 [MultiCommandJob] DBClientCursor::init call() failed
Sat Jul 14 15:49:09 [rsMgr] replSet not electing self, not all members up and we have been up less than 5 minutes
Sat Jul 14 15:49:09 [rsMgr] replSet info electSelf 4
Sat Jul 14 15:49:09 [rsMgr] replSet PRIMARY

electSelf shouldn't proceed unless more than 5 minutes has elapsed, so one of two conditions must have occured:

1. The static initialization of time_t started = time(0) failed (seems unlikely given other log output).
2. weAreFreshest() set allUp to true and returned true, which would be the case any time rs.getTargets(L, ver) returns no Targets.