One of the parlor games Republicans are playing in the shadows of the Russia investigation is this: Who would President Pence pick as his vice president?

Quick refresher: If a president leaves offices for any reason, the sitting Vice President takes over and picks his number two, subject to majority vote in the House and Senate.

Quick stipulation: Yes, this is premature and highly speculative and premised solely on Trump leaving office for whatever reason.

The various theories being tossed around: