(CNN) - Ted Cruz is heading back to Iowa, again.
The freshman senator from Texas and possible 2016 GOP White House contender is making his fourth visit since last July to Iowa, the state that kicks off the presidential caucus and primary calendar.
Cruz, a favorite of many tea party activists and other grassroots conservatives, will give the keynote address Tuesday at a daylong event in Des Moines organized by homeschooling activists from across Iowa.
Cruz speaks to the Network of Iowa Christian Home Educators (NICHE), a politically-engaged group that has previously hosted presidential contenders. Home school advocates, who tend to be politically active and often conservative and religious, supported the last two GOP winners of the Iowa caucus: former Arkansas Gov. Mike Huckabee in 2008 and former Sen. Rick Santorum of Pennsylvania in 2012.
CNN has learned that Cruz will also have lunch with some leading Hawkeye State conservatives before he gives his address. They include Bob Vander Plaats, president and CEO of the Iowa-based The Family Leader, a major social conservative group, and Rep. Steve King, a conservative firebrand, according to a source with knowledge of the senator's schedule.
In his speech, Cruz is expected to tout the recent legislative successes won by home school advocates in Iowa, and the senator will say those victories are a good model for home schoolers across the country, according to the source.
Cruz is also expected to say that school choice is the civil rights issue of our time.
Later in the Day, Cruz speaks at a Cerro Gordo County GOP Dinner in Mason City, Iowa.
Cruz headlined the Iowa GOP's annual summer picnic last July. He was back in the Hawkeye State a month later to speak at a Family Leader summit. In October, Cruz returned to Iowa to make an address at the state party's Ronald Reagan Dinner, and joined King the next day at the congressman's annual Col. Bud Day Pheasant Hunt and Defenders of Freedom event.
Cruz has made more trips to Iowa since the last presidential election than any of the other potential Republican or Democratic 2016 contenders.