ABC News reports that state Sen. Mark Messmer is projected to win the crowded GOP primary in Indiana's 8th District, which is currently held by Rep. Larry Buschon. Messmer defeated former Rep. John Hostettler and several other candidates in a race that attracted significant outside spending.

—Jacob Rubashkin, Inside Elections

Indianapolis’s Marion County is reporting votes now in Indiana’s 6th, too. And according to the AP, Shreve is beating Speedy there 38 percent to 29 percent, likely cutting off any chance for the more conservative Speedy to prevail.

—Nathaniel Rakich, 538

The Associated Press has projected that state Sen. Mark Messmer has won the GOP nomination in the 8th District. He will likely win the general election this fall. ABC News is not reporting a projection in the race yet, but Messmer has about 43 percent of the vote — 27 percent more than his closest challenger — with 40 percent of the expected vote reporting.

—Jacob Rubashkin, Inside Elections

We’re up to about half of the expected vote counted in Indiana‘s 6th District, and Jefferson Shreve is still holding steady in the lead with 29 percent. Jamison Carrier and Mike Speedy are running behind at 21 and 20 percent, respectively.

—Jacob Rubashkin, Inside Elections

As Meredith alluded to, the GOP primary in the 5th District is competitive today after Spartz decided to seek reelection, but only after a Hamlet rendition of "to run or not to run."

In February 2023, Spartz surprised the political world by announcing that not only would she not run for Indiana's open Senate seat, she also wouldn't seek reelection. She then repeatedly flip-flopped on whether she might reconsider her decision before announcing in February that she would indeed seek reelection, just days before the filing deadline. Spartz's decision upset the plans of the many GOP contenders who'd entered the race in the meantime — 11 candidates (including Spartz) are on the primary ballot.

However, state Rep. Chuck Goodrich looks like a real threat to Spartz. The CEO of an electrical contracting company, Goodrich has self-funded heavily — $4.6 million of the $5.5 million he'd raised as of April 17 — to give himself a significant financial advantage over Spartz, who had only raised $581,000 after barely fundraising throughout 2023. Even with the money she already had in the bank, Spartz has been outspent $4.1 million to $2 million by Goodrich.

Goodrich has emphasized his America First views and attacked Spartz, most notably by casting her as overly supportive of Ukraine in its war against Russia. Spartz is Ukrainian American, and Goodrich has claimed she's been "putting Ukraine first" while using an image of Spartz with Biden after the passage of Ukraine military aid in 2022. However, Spartz's record is more nuanced: She has been critical of Ukrainian President Volodymyr Zelenskyy and opposed the most recent round of Ukraine aid that Congress passed in April.

Yet Goodrich's attacks may be working: A late March poll for his campaign by pollster Mark It Red found him almost running even with her, trailing just 33 percent to 30 percent — a change from earlier polls that gave the incumbent a larger lead.

—Geoffrey Skelley, 538