Democrats are embracing the f-bomb in congressional campaign messaging as they seek to tap into their party’s anger. In recent weeks, a number of newly launched Democratic hopefuls for key House and Senate seats have pledged to “unf‑‑‑ our country” or have urged their party to “drop the excuses and grow a f‑‑‑ing spine.” The ads are indicative of the rising temperature in American politics generally, but they also underscore the ways politicians are trying to resonate with base voters, many of whom have expressed frustration with Democratic leaders. “I think that in the case of the Democratic candidates …...