NASHVILLE, Tenn. (AP) — Tennessee state Rep. Gloria Johnson, a Democrat who skyrocketed to national fame after surviving a Republican-led expulsion effort for participating in a gun control demonstration, on Tuesday formally announced that she's running for U.S. Senate.

Johnson, 61, is running for a seat currently held by Republican U.S. Sen. Marsha Blackburn, 71, who is seeking reelection in a state that has solely elected GOP statewide candidates for nearly two decades.

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