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Scott Romney, her father and Mitt's older brother, had been mulling a bid. But ruled it out Tuesday night, telling the newspaper that "it just wasn't right for me at this time" and encouraging her to run instead.

Romney McDaniel was active in her uncle's presidential campaign last year. Her mother, Ronna Romney, had two unsuccessful runs for the Senate in the 1990s.

Democrats are favored to hold onto retiring Sen. Carl LevinCarl Milton LevinListen, learn and lead: Congressional newcomers should leave the extremist tactics at home House Democrats poised to set a dangerous precedent with president’s tax returns The Hill's 12:30 Report — Sponsored by Delta Air Lines — White House to 'temporarily reinstate' Acosta's press pass after judge issues order | Graham to take over Judiciary panel | Hand recount for Florida Senate race MORE's (D-Mich.) seat in the blue-leaning state.