Everything you need to know about the controversial rise and fall of Katie Hill

After she won reelection last year as part of a historic, female-driven wave for House Democrats, the party picked Rep. Katie Hill (Calif.) to be one of its faces of success.

She is young (32), diverse (one of the first openly bisexual members of Congress), politically astute (her first time running for office was for this seat) and from the kind of district that helped the Democrats win back the House last year and that they hope to keep.

But as swift as her rise came her fall. Hill is...