Ideology is notoriously hard to measure — especially for presidents like Franklin Roosevelt who didn’t serve in Congress — but it looks like Sanders would stand out as quite a bit more liberal than the last three Democratic senators who became president. Looking at congressional voting scores provided on voteview.org (for economic issues), Sanders stands out from the rest of the group. With a score of -.368, Obama was more liberal than John F. Kennedy (-.308) and Lyndon Johnson (-.236). (The more negative a score, the more liberal a candidate was.) Sanders was even more liberal than that. His score was -.523 in the 113th Congress.
