“Trumpapalooza” opens in Dallas. The Senate is now a toss-up.

Republicans open their first-ever midterm convention in Dallas tomorrow night, a two-day show the RNC chairman, Joe Gruters, has called a “Trumpapalooza.” The hall is the American Airlines Center. President Trump is down for both nights. Vice President JD Vance keys Wednesday. The Texas Tribune timed the gathering to a Senate map that just went from lean-GOP to a coin flip.

Decision Desk HQ said Monday that its Senate forecast is a “pure toss-up” for the first time since early June: 50–50 across a million simulations. A 50–50 chamber would still belong to Republicans on Vance’s tie-break. The modal outcomes, the desk wrote, are now about equivalently that tie and a 51–49 Democratic majority. Democrats need a net gain of four seats from a 53–47 Republican Senate. Maine, Texas, Ohio, Alaska and Iowa are all toss-ups. In the House, DDHQ gives Democrats a 67 percent chance of taking the gavel.

The DDHQ Forecast now has the U.S. Senate as a pure toss-up for the first time since early June.

The convention is a turnout machine dressed as a history exhibit. Organizers talk 20,000 to 30,000 a night. Hours before the doors, the party is giving tickets away — lottery, free passes, unsolicited “FREE TICKETS” notes — to fill an arena that holds about 21,000. Donors who want a roundtable with the president are asked for $250,000; a photograph, $88,600. A meeting with Vance is $75,000. At least 45 Republican lawmakers and candidates, La Voce di New York counted, are hesitating or staying home. Association with a president whose approval sits in the 30s is a math problem, not a loyalty test.

The stage list is Texas and the Cabinet. Gov. Greg Abbott, Lt. Gov. Dan Patrick, Sen. Ted Cruz and Attorney General Ken Paxton are on it. So are Treasury Secretary Scott Bessent, Attorney General Todd Blanche, Health Secretary Robert F. Kennedy Jr. and CMS Administrator Mehmet Oz. Ten Texas politicians will speak. Several of them are running in seats the legislature redrew last summer to flip. Democrats are sending their own people to Dallas for counterprogramming. Early voting is less than six weeks out.

The Politics desk files a party that wants a pep rally and a forecast that will not clap along. Eight weeks is the sprint. Affordability is still the issue Jessica Taylor of the Cook Political Report named on Labor Day. A two-night convention does not lower the pump. It fills a building. Whether it fills a ballot is the rest of the calendar.