It’s on.

Three of the Tea Party's biggest stars, Sarah Palin and Sens. Ted Cruz and Mike Lee are joining in a national “Liberty Rally” to back conservatives running in key Senate races.

Palin's political action committee, SarahPAC, today said that the trio will kick off the rally in Oklahoma where former House Speaker T.W. Shannon is running for the seat being vacated by Sen. Tom Coburn.

“Shannon is the constitutional conservative candidate,” cheered SarahPAC’s email to supporters. That rally takes place today.

Cruz, Palin and Lee are also planning to be in Nebraska on Friday to help Senate candidate Ben Sasse. On Sunday, Palin will travel to Iowa to host a “Heels On, Gloves Off” rally for Senate candidate Joni Ernst.

Tim Crawford, the treasurer of SarahPAC, wrote, “Republicans have a chance to send conservatives to Washington D.C. who don't just talk the talk, but walk the walk when it comes to standing up for conservative values. If you're in the Oklahoma, Nebraska, or Iowa area, we hope you'll come out to join Governor Palin for one of these great events.”

Paul Bedard, the Washington Examiner's "Washington Secrets" columnist, can be contacted at