[Grim]

Obama can't pardon her if she's not indicted or convicted.

— Ford pardoned Nixon without an indictment, I believe.

Nixon was in fact charged by the House of Representatives.

Nixon charged with first of three articles of impeachment

On this day in 1974, the House of Representatives charges President Richard M. Nixon with the first of three articles of impeachment for obstruction of justice after he refused to release White House tape recordings that contained crucial information regarding the Watergate scandal.

Source:History Channel "This day in history" — http://www.history.com/this-day-in-history/nixon-charged-with-first-of-three-articles-of-impeachment

[Verginius Rufus]

The House Judiciary Committee (under Peter Rodino) voted for three articles of impeachment, but Nixon resigned before the full House of Representatives considered the articles.