The impeachment update, the Elizabeth Warren/Bernie Sanders exchange, Andrew Yang’s staff has unionized, Joe Walsh protests Republican primary cancellations at RNC headquarters, and a change in Iowa caucus rules might make the outcome confusing.

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Links:

• Chris Higgins website
• Chris Higgins on Twitter
• Chris Higgins on Instagram
• Election Ride Home on Twitter
• Election Ride Home on Facebook
• Seven things to know about the Trump trial (The Hill)
• Senate braces for Trump impeachment trial (The Hill)
• What senators can say, read and do: Decorum guidelines for Trump's impeachment trial (NBC News)
• Giuliani associate Parnas says Trump 'knew exactly what was going on' (NBC News)
• Democrats release more Parnas evidence, including voicemails with Trump associates (Politico)
• Five takeaways from Parnas's Maddow interview (The Hill)
• Ukraine launches criminal investigation into alleged threats against former US Ambassador Marie Yovanovitch (The Hill)
• The Guardian impeachment/politics liveblog, Thursday (The Guardian)
• Articles of Impeachment Delivered to Senate (C-SPAN)
• 18 progressive groups sign unity pledge amid Sanders-Warren feud (The Hill)
• Sanders’ wife on feud with Warren: ‘This discussion is over’ (AP)
• Andrew Yang’s staff become latest campaign workers to unionize (CNBC)
• Walsh plans protest at RNC headquarters over 'nakedly anti-Democratic' primary cancellations (The Hill)
• Cancellation of state caucuses or primaries [Republican] (Wikipedia)
• AP Explains: New rules could muddle results of Iowa caucuses (AP)
• The caucus change that has Iowa bracing for a hot mess (Politico)

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