Kudos to Wolfpaw.

Nixon thought both JFK and Ted were LMF, to use the military term. RFK was the exact opposite of course. Here are the quotes you all wanted...
Nixon on JFK: "he's intelligent but lazy, and has satyrisis if he doesn't fulfill his rutting panther tendencies."
Nixon on Ted: "... a deadbeat who'd be on skid row if it weren't for his father's money and brothers' success."
Nixon on RFK: "Bobby's the smartest of the bunch, but like Jack he's incredibly rude to subordinates + staff..."
The best comparison of RFK and Nixon's personalities is this. Nixon would do anything to avoid silence, Bobby would do anything to avoid making small talk. Both are political loners, and both are not averse to electronic eavesdropping. For Nixonland readers: both are Orthogonians. RFK set the pre-PATRIOT records for electronic surveillance while AG. RFK cited executive privilege when asked about the MLK wiretapping: "National security, and that's all the answer you're gonna get!"