Phil Elliott reports that Senator John Thune will endorse Republican presidential candidate Mitt Romney:

Presidential candidate Mitt Romney was set to announce Wednesday the endorsement of South Dakota Sen. John Thune, a rising star in the Republican Party who had weighed a White House bid of his own before deciding to stay in the Senate and move up in his party's leadership.

Thune is the latest high-profile Republican to back Romney, the former Massachusetts governor who opened the week with the backing of another emerging GOP star, Sen. Kelly Ayotte of New Hampshire. Romney, who enjoys steady support in the polls and a sophisticated political and fundraising machine, is looking to demonstrate his strength with fewer than six weeks before the first nominating contests.

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