The most out-of-place figure on the first night of the DNC will be John Kasich, the Republican former governor of Ohio.
Kasich was a candidate for the GOP nomination in 2016, and has turned into a prominent voice of the party's "Never Trump" movement. And while his selection for a speaking slot at the convention angered progressives, handing the spotlight to such a well-known Republican could help Biden's campaign strike chords of unity.
Kasich won't be alone among the Democrats.
Former New Jersey Republican Gov. Christine Todd Whitman, former Hewlett Packard CEO Meg Whitman, who ran for governor as a Republican in California in 2010 but backed Hillary Clinton in 2016, and former New York Republican Rep. Susan Molinari will speak in the run-up to Kasich's address.
There is a history of political parties inviting a former political rival into their convention lineup. In 2008, then-Connecticut Sen. Joe Lieberman — just eight years after being the Democratic vice presidential nominee — spoke at the Republican National Convention in favor of then-Arizona Sen. John McCain. In 2012, Charlie Crist, who had previously served as the Republican governor of Florida (and is now a Democratic congressman), backed former President Barack Obama's re-election at that year's DNC.
What we know: Kasich's message is likely to be oriented toward the need for a functioning government. As a 2016 presidential contender, he often touted his role as a one-time House budget chairman who negotiated spending plans with a surplus with former President Bill Clinton.