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The Tea Party-backed senator quickly sought a national profile following his 2010 win, and narrowly lost a run for a GOP leadership position at the end of 2011. But his profile has been eclipsed in the Senate by other Tea Party-affiliated stars, including Sens. Marco RubioMarco Antonio RubioChina's TikTok turns to former lawmakers to help with content moderation policies Hillicon Valley: Warren turns up heat in battle with Facebook | Instagram unveils new data privacy feature | Advocacy group seeks funding to write about Big Tech TikTok adds former lawmakers to help develop content moderation policies MORE (R-Fla.), Ted CruzRafael (Ted) Edward CruzThe Hill's Morning Report - Dem debate contenders take aim at Warren The Hill's Morning Report - Trump grapples with Turkey controversy This week: Congress returns to chaotic Washington MORE (R-Texas), Rand PaulRandal (Rand) Howard PaulCheney unveils Turkey sanctions legislation CNN catches heat for asking candidates about Ellen, Bush friendship at debate Overnight Defense — Presented by Boeing — Trump isolated amid Syria furor | Pompeo, Pence to visit Turkey in push for ceasefire | Turkish troops advance in Syria | Graham throws support behind Trump's sanctions MORE (R-Ky.) and Mike LeeMichael (Mike) Shumway LeeHillicon Valley: FCC approves T-Mobile-Sprint merger | Dems wrangle over breaking up Big Tech at debate | Critics pounce as Facebook's Libra stumbles | Zuckerberg to be interviewed by Fox News | Twitter details rules for political figures' tweets Republican lawmaker proposes transferring drone authority to local governments A decade of policymaking failures is to blame for new Syria crisis MORE (R-Utah).


Iowa visits often indicate interest in a presidential run, though it's unclear what Johnson's goal might be for the trip. Two other Wisconsin Republicans, Gov. Scott Walker and Rep. Paul RyanPaul Davis RyanAmash: Trump incorrect in claiming Congress didn't subpoena Obama officials Democrats hit Scalia over LGBTQ rights Three-way clash set to dominate Democratic debate MORE, are also viewed as potential presidential aspirants.