When Americans cast their ballots in this year's midterm elections, they'll not only be picking who represents them in Congress, but also weighing in on a range of topics that could change their state laws and constitutions.

President Donald Trump's political groups have spent more than one-quarter of a billion dollars to bolster Republicans in the final stretch of this year's midterm elections, an unprecedented amount for a sitting president that underscores the stakes on Nov. 3.