LORELAI: Man, that was some stealthy little maneuver she pulled there, huh? Applying the guilt over not knowing about the Dean breakup and making you all weak, and then using that to get Jess to come to dinner on Friday. She’s like Lyndon Johnson with the Senate, effortless.
Lyndon B. Johnson (1908-1973), often referred to by his initials LBJ, the 36th president of the US from 1963 to 1969. Elected to the US Senate in 1948, he was appointed Senate Majority Whip in 1951, and Majority Leader of the Senate in 1954.
Lyndon Johnson is considered the most effective Senate majority leader in history. He was unusually proficient at gathering information, discovering exactly where every senator stood on issues, his philosophy and prejudices, his strengths and weaknesses and what it took to get his vote.
Central to his control of the Senate was what was called “The Treatment”, his way of emotionally manipulating, intimidating, or bullying people into doing what he wanted. Lorelai is suggesting that Emily uses similar techniques to get her own way.
The Annotated Gilmore Girls 