Question

a lengthy speech designed to delay or kill the vote on a bill; used only in the senate. checks and balances and 3 separate branches, congressional session, federalism, filibuster

Explanation:

The description matches the definition of a filibuster, which is a Senate-specific tactic involving prolonged speeches to block or delay a bill vote. The other options refer to broader government structures (Federalism, Checks and Balances) or a legislative time period (Congressional Session), which do not fit the given definition.

Answer:

Fillbuster