What will Bill Clinton do at the convention?

When Bill Clinton takes the stage on the second night of the Democratic National Convention in Philadelphia, it will be his most high-profile appearance to date on behalf of his wife, a former first lady who spent years filling the supporting role he now occupies.

Hillary Clinton marched to the Democratic nomination with the help of the party’s old guard, with one glaring exception: its most popular living former president. While Bill Clinton surfaced at a handful of fundraisers and stump speeches, he rarely joined his wife on the trail and spent most of the primary season hunkered down at his eponymous foundation.