Indiana primary voters head to the polls: so what's at stake?

The state of Indiana goes to the polls on Tuesday, and while the results won't guarantee the nomination for either front-runner, strong showings could mean that ultimate victory is all but assured for Donald Trump and Hillary Clinton.

But their rivals are doing everything they can to stop that from happening.

Ted Cruz and Bernie Sanders are hoping that they can keep the delegate numbers in their favour, and force not one, but two contested party conventions come July.

Video by Olivia Lace-Evans.