President Obama’s healthcare law isn’t just a big issue in the 2012 presidential campaign — it’s on the ballot directly in a handful of key states.

Republican candidates have worked hard to make “ObamaCare” a central issue in their push to unseat the president as well as several Democratic senators. In some states where attacks on the law have been strongest, voters will have a chance to weigh in on healthcare apart from those races.

Swing-state Florida is one of four states where voters will be asked to formally register their disapproval of the Affordable Care Act’s least popular provision — the mandate requiring most taxpayers to buy insurance or pay a tax penalty.

Florida’s ballot measure would change the state constitution to stipulate that “a law or rule may not compel, directly or indirectly, any person or employer to purchase, obtain, or otherwise provide for health care coverage.”