We're down to the final four of the Arizona History Showdown.
How it works: Click here to vote in the third round. Voting closes at 5pm.
We'll show you the results in Friday's Axios Phoenix.
State of play: Round 4 features matchups between, arguably, Arizona's four most famous political figures.
Barry Goldwater faces Sandra Day O'Connor, while John McCain goes head-to-head against Carl Hayden.
Flashback: Goldwater and O'Connor had a long history.
The two were neighbors in Paradise Valley, and O'Connor aided Goldwater's first U.S. Senate campaign in 1958.
Goldwater called President Reagan to urge him to appoint O'Connor to the U.S. Supreme Court, and became a leading supporter when her nomination faced criticism from the right.
Catch up quick: We combined the two 16-entry brackets we started with into one after the first round, but you can see the results of the first round of voting here.