Happy primary day, Hoosiers! Indiana is easily forgotten on the primary calendar, sandwiched as it is between sexier states like Pennsylvania and Maryland (don't look at me like that — have you seen that flag?). But if you care about how well Congress functions, you'll want to pay attention to today's primaries, even if you don't watch "Stranger Things" and "Parks and Rec" on repeat.

As my colleagues recently so beautifully illustrated, there are several parties within the parties in Congress. On the Republican side, there are pragmatists who fall in line with party leadership — and then there are obstructionists who tend to make life harder for them.

This year, there are three open House seats in Indiana that could send either type of representative to Congress. And because these seats are safely Republican, today's contests, not November's, will effectively determine that. Elsewhere in the state, Rep. Victoria Spartz — the Hamlet from Hamilton County — could be the second incumbent representative of the cycle to lose reelection, and GOP primary voters will also choose who will likely become the next chief executive of this state of nearly 7 million people. So yeah, the stakes are high!

We won't have to wait long to find out the winners: Polls close in most of Indiana (the parts in the Eastern time zone) at 6 p.m. Eastern, with the parts of the state in the Central time zone following suit at 7 p.m. Eastern. Follow along with us for the next few hours, won't you?

—Nathaniel Rakich, 538

Tonight, we'll be monitoring how candidates of color perform in primaries for governor, U.S. Senate and the U.S. House of Representatives. Overall, 11 people of color are running in these contests — six Republicans and five Democrats.

The most likely primary winner is Democratic Rep. André Carson, who is Indiana's lone Black representative on Capitol Hill (and was also only the second Muslim ever elected to Congress). Democrats in the solidly blue 7th District look set to renominate him against two little-known Black Democrats.

In the dark-red 4th District, insurance executive Rimpi Girn is an Indian immigrant who has raised at least a little money, so she may be the favorite for the Democratic nomination — but a November defeat against GOP Rep. Jim Baird is a near-certainty.

In the Democratic primary for U.S. Senate, clinical psychologist Valerie McCray is running a long-shot race to become the state's first Black U.S. senator. She ran for the state's 2022 Senate contest but failed to make the ballot and briefly ran for president in 2020. However, she's raised only $14,800, less than the $112,000 former state Rep. Marc Carmichael has brought in. Still, either Democrat will be a huge underdog against Rep. Jim Banks in the general election.

It's less clear if any candidate of color has a shot at winning a GOP primary. On paper, the contender with the best chance might be "Honest Gabe" Whitley, who has raised $364,000 in the solidly Democratic 7th District, making him the only Republican in that race to have reported raising anything. But Whitley is a lightning rod of controversy: Among other things, he faces accusations of concocting false donors and a fictional veterans organization to back his candidacy.

In the 5th District, speech-language pathologist and business owner Raju Chinthala is running, but he's unlikely to finish ahead of the incumbent Spartz or her leading challenger, Goodrich. Two Republican Latino candidates are running in the 1st District — Mark Levya and Ben Ruiz — but Lake County Councilmember Randy Niemeyer is the party's preferred candidate to take on Democratic Rep. Frank Mrvan.

Lastly, the best-known Republican on this list is Curtis Hill, who is making a long-shot bid for governor. Hill lost renomination for state attorney general in 2020 after allegations came out that he had groped a group of women at a party.

—Geoffrey Skelley, 538