A referendum battle and nail-biter runoffs: What to know about Tuesday's elections

President Joe Biden and former President Donald Trump have locked down the Democratic and Republican presidential nominations, but that doesn’t mean there aren’t major elections and ballot measures at stake ahead of November.  

On Tuesday, voters in Arkansas and Mississippi will make their voices heard in tight runoff elections. One Arkansas race has even divided Arkansas Gov. Sarah Huckabee Sanders and her father, former Gov. Mike Huckabee, the Associated Press reported.

And in Wisconsin, voters will consider two Republican-backed ballot measures that will impact how elections are funded and conducted in the pivotal swing state.  

Biden and Trump...