But if Mrs. Clinton runs for president in 2016, one thing is almost certain: she won’t be as popular as she is right now. Recent polls show that about 65 percent of Americans take a favorable view of Mrs. Clinton, while only about 30 percent have a negative one. Those are remarkably high numbers for a politician in an era when many public officials are distrusted or disliked.

But part of the reason for Mrs. Clinton’s high numbers is that, as secretary of state, she has remained largely above the partisan fray that characterizes elections and fights over domestic policy.

Over the course of her long career, the public’s views of Mrs. Clinton have shifted along with her public role. When she has been actively engaged in the hand-to-hand combat that characterizes election campaigns and battles in Congress, her favorability ratings have taken a hit, only to recover later.

Mrs. Clinton might be the most polled about American in history, other than those who have actually become president. Between the PollingReport.com database and other publicly available polling archives, I was able to identify about 500 high-quality telephone surveys that tested her favorability ratings with the public.

In the chart below, I’ve taken a moving average of Mrs. Clinton’s favorable and unfavorable ratings dating back to 1992. (The average is based on the 10 surveys that were conducted closest to the given date). The chart also highlights some of the most important moments of Mrs. Clinton’s career.