Does the state of public opinion on a public policy issue create obligations for political leaders, obligations they ignore at their peril? This is an issue being debated in the United States right now about a specific public policy controversy – gun control – but the core issue applies everywhere. In the specific case of the United States, many readers will know that there was an attempt to pass legislation requiring background checks before you can buy guns online or at gun shows. The legislation was blocked in the US Senate in spite of the fact that opinion polls say again and again that 90 per cent of Americans polled support the measure. So, the question is being asked and debated: how can 90% of the people support a measure and it does not become law? Very often the question is asked with real heat. Now, we are not going to get into the Byzantine complexities of American politics. What I am interested in is bringing to your attention what professional political scientists who blog have been saying about the core, universally relevant issue: does the state of public opinion create unavoidable obligations for political leaders?