[gridlock]

Soon he carved out an independent streak on Capitol Hill by introducing amendments without consulting the party heads, filibustering, and even criticizing the dictates of then-Majority Leader Lyndon B. Johnson.

In that respect, he resembled to a certain degree the style of a latter-day maverick and government spending critic, Arizona Republican Sen. John McCain.

John McCain is not fit to shine Proxmire's shoes.

[FreeReign]

John McCain is not fit to shine Proxmire's shoes.

Both were very similar with respect to Campaign Finance Reform. Maybe that's why they were both called mavericks.