As part of an ecumenical agreement between the Episcopal Church USA and the Evangelical Lutheran Church of America in 2001, ELCA agreed to have a bishop in apostolic succession present at all future consecrations of new ELCA bishops. Usually, they choose an Episcopal Church bishop or a Swedish Lutheran bishop, I'm told, though they don't have to. They also agreed to have at least three bishops present at all future consecrations and ordinations (Though there is an opt-out clause for pastors who have moral objections to being ordained into Apostolic Succession, which has so far only been exercised by about a dozen people thus far). As a result, our ecumenical office reports than more than 50% of ELCA bishops are now in apostolic succession, along with an indeterminate number of pastors. The goal is that Episcopalian priests and Lutheran pastors will ultimately be interchangeable and be able to serve in each other's parishes/congregations with the permission of the bishops involved; which is already happening in some areas (and comes in very handy for parishes/congregations that can't afford to hire their own priest/pastor and can borrow the local "sister" denomination's minister for a weekly service). Some folks also hope this could be a prelude to an eventual merger many years down the line.
John