HOMESTEAD, Fla. (AP) — The latest from Homestead-Miami Speedway, the site of NASCAR's season finale (all times EST):

12:45 p.m.

Count No. 42 among those pulling for No. 24 in NASCAR's season finale.

Bill Clinton, the 42nd President of the United States, expressed support for four-time champion Jeff Gordon on his Twitter page.

"I'm excited to watch @JeffGordonWeb's last thrilling ride tomorrow. He's a great friend to me and to the @ClintonFdn. Best of luck #Team24!" Clinton posted.

Gordon is one of four drivers remaining in contention for the title. Kyle Busch, defending series champion Kevin Harvick and Martin Truex Jr. also will race for the championship Sunday.

NFL Hall of Fame quarterback John Elway, who knows a thing or two about championship drives, also has a rooting interest in the finale. Elway, the general manager and executive vice president of football operations for the Denver Broncos, wished Truex luck.

Truex's Furniture Row Racing team is based in Denver.

"All the best to our hometown @FR78Racing team, Driver @MartinTruex_Jr & Owner Barney Visser w/their championship race tomorrow!!" Elway tweeted.

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12:15 p.m.

Rain is threatening the start of NASCAR's season finale.

The track is dry for now, but dark clouds loom and forecasts call for afternoon thundershowers. The green flag is scheduled for 3:15 p.m.

NASCAR officials say they won't start the race unless they believe they can finish it. They also have no plans to alter their current race rules, meaning the finale could be deemed official any time after the halfway point in the 400-mile race.

Last week's race in Phoenix was shortened by 93 laps because of storms.

But would NASCAR really end its championship event early?

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AP Sports Writers Jenna Fryer and Dan Gelston contributed to this report.