A bloc of Trump voters in key swing states also backs Democratic Senate candidates. Here's why that matters.

• Donald Trump hopes to push several swing-state GOP Senate candidates over the finish line.
• But some of his supporters say they plan to back Democrats in those races instead.
• These split-ticket voters could end up having a major impact on the country.

In recent presidential election cycles, the level of ticket-splitting — where people vote candidates from different parties on their ballot — has plummeted.

Some 20 years ago, then-Democratic presidential nominee John Kerry lost GOP-leaning states like Arkansas and North Dakota even as the incumbent Democratic senators in those states — Blanche Lincoln and Byron Dorgan — coasted to victory.