President Donald Trump on Saturday urged the crowd at Olentangy Orange High School to support Republican Troy Balderson in the U.S. House of Representatives 12th District special election.

Trump noted that whichever party has the White House tends to lose seats in Congress in the midterm.

“Why? We have the greatest economy in the history of our country. ... I think it could be a red wave,” Trump told a packed, steamy gymnasium in Delaware County.

The county is key for Balderson’s chances to defeat Democrat Danny O’Connor, the Franklin County recorder that has made Tuesday’s election a very tight race in a district Trump won by 11 points.

Reportedly, more than 10,000 people requested tickets to attend the president’s rally, and thousands were turned away or watched on monitors in overflow rooms. It’s the kind of attention that Balderson, a state senator from Zanesville and a solid Trump supporter, needs if he’s going to pull out a win Tuesday.

As Trump prepared to speak, O’Connor, the Franklin County recorder, campaigned in other parts of Delaware County, hosting his own events, albeit much smaller.

He met a group of roughly 30 supporters outside a Delaware church, one of at least five events on Saturday.

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