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“It's a great way to meet Gov. Palin and hear from Sarah about the key issues of the campaign,” Steelman’s campaign wrote in the invite on the candidate’s Facebook page.

Steelman is facing off against two other Republicans — businessman John Brunner and Missouri Rep. Todd Akin — in the Aug. 7 primary. Palin’s support could mean all the difference in the race by helping Steelman stand out from the other Republicans, both running as conservatives.

Palin last hit the campaign trail for Ted CruzRafael (Ted) Edward CruzDebbie Wasserman Schultz marks 10 years as breast cancer survivor Foreign agent registration is no magical shield against Russian propaganda Let Trump be Trump and he'll sail through 2020 MORE, who on Tuesday won the Republican primary for the Texas Senate race.

Whoever wins the GOP primary will go on to face Sen. Claire McCaskillClaire Conner McCaskillDemocrats turn on Al Franken Trump rips Dems a day ahead of key White House meeting The Hill's 12:30 Report MORE (D-Mo.) in November. McCaskill was trailing all three candidates in a Mason-Dixon survey released last week. The Hill rates the Missouri Senate race as a toss-up.