Note that this is different from the Ranger Grant bug where the only thing you can say to him is 'goodbye'. Some say use the command 'setstage 00136166 100' to end the quest manually, but this is a poor workaround, as if one uses this to complete For the Republic Part 2, Legate in the end quest never appears. It asks you to talk to Ranger Grant, but you cannot initiate ANY dialogue with him, unable to progress. If course, this is a bug and the game stops. If you then work for the NCR, they will give you the same quest of saving the president.
This bug can be reproduced when you do Yes Man's quests, after his version of saving the president.
