CQ vote studies

Joe Walsh is challenging Donald Trump, here are some congressional basics
Walsh served only one term in Congress as part of the tea party wave of 2010

Rep. Joe Walsh, R-Ill., speaks at a news conference with other House Republicans in the Capitol Visitor Center on the topics of a proposed balanced budget amendment and also the ongoing debt ceiling talks. (Tom Williams/Roll Call file photo)

Former Illinois Republican Representative Joe Walsh took a dive into the presidential pool Sunday by announcing a primary challenge to President Donald Trump.

Joe Sestak is running for president, here are some congressional basics
Eye on 2020

Former Rep. Joe Sestak leaves the set after the Senate Democrats primary debate with Katie McGinty and Braddock, Pa., Mayor John Fetterman at WTAE-TV in Pittsburgh on Tuesday, April 5, 2016. One of the three Democrats will be selected in the April 26th primary to run against Sen. Pat Toomey, R-Pa. Bill Clark/CQ Roll Call

A latecomer to a crowded presidential field, former Pennsylvania Rep. Joe Sestak announced his candidacy for the Democratic nomination for president Sunday.

Seth Moulton is running for president, here are some congressional basics
Eye on 2020

Rep. Seth Moulton, D-Mass., arrives for a meeting of the House Democratic Caucus (Tom Williams/CQ Roll Call).