How did Roger Stone survive Watergate?

In an article in the Washington Post, the former director of the Nixon Presidential Library wrote about Stone's relationship to Nixon.

As a member of President Richard M. Nixon’s Committee to Re-Elect the President, better known as CREEP, Stone helped recruit a young operative to spy on a group of Quakers who had set up a peace vigil in front of the Nixon White House. Stone also admitted to Congress that he faked a contribution from the Young Socialist Alliance to Pete McCloskey, a liberal Republican who in 1972 was mounting a challenge to Nixon in the New Hampshire primary. After delivering the $135 in cash and receiving a receipt, Stone then drafted an anonymous letter to the conservative Manchester Union Leader with a photocopy of the receipt to discredit McCloskey.

Stone did not merely engage in dirty tricks; in 1972, the then-19-year-old Stone was assigned by CREEP official Herbert “Bart” Porter to recruit a spy to penetrate the campaigns of Democratic presidential hopefuls. The secret Nixon agent, Michael W. McMinoway, introduced himself successively into the campaigns of Edmund Muskie, Hubert Humphrey and George McGovern. Stone became his case officer, receiving intelligence from McMinoway via a post office box in Washington.

This was an interesting article especially after seeing the Nixon Foundation try really hard to distance itself from Stone.