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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 RubioLobbying world Former Florida congressmen mull bipartisan gubernatorial run: report Winners and losers from Jim Bridenstine’s confirmation as NASA administrator MORE (R-Fla.), Ted CruzRafael (Ted) Edward CruzCruz urges UK to allow British toddler's parents to transfer him for treatment Maxine Waters to Trump: ‘Please resign’ Cruz challenger says ‘no thanks’ to funding from Steyer MORE (R-Texas), Rand PaulRandal (Rand) Howard PaulPompeo set to be confirmed on Thursday GOP anxiety grows over Trump’s Iran decision Overnight Defense: VA nominee on the ropes | White House signals it will fight for pick | Trump talks Syria with Macron | McConnell tees up Pompeo vote MORE (R-Ky.) and Mike LeeMichael (Mike) Shumway LeeSenators to Trump: Let Mueller finish Russia probe The Hill's Morning Report: Can Trump’s VA pick make it through the week? Mike Lee pens op-ed calling legislation to protect Mueller 'unconstitutional' 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 RyanMcMorris Rodgers seeks to tamp down unrest Conservative group unveils plan to slash spending by trillion Arizona GOP winner to join Freedom Caucus MORE, are also viewed as potential presidential aspirants.