"As a member of the House of Representatives for the last few years, I have fought tooth-and-nail against President Obama's agenda at every turn. I was the first member of Congress to call him a socialist who embraces Marxist-Leninist policies like government control of healthcare and redistribution of wealth," he writes in a letter to potential fundraisers obtained by The Atlanta Journal-Constitution.

Broun is the only candidate who's so far announced for the seat left open by Sen. Saxby ChamblissSaxby ChamblissLobbying World Former GOP senator: Let Dems engage on healthcare bill OPINION: Left-wing politics will be the demise of the Democratic Party MORE's (R-Ga.) decision to retire, though a number of other Georgia Republicans, including Reps. Tom Price, Jack Kingston, Phil GingreyPhil GingreyBeating the drum on healthcare Former GOP chairman joins K Street Former Rep. Gingrey lands on K Street MORE and Tom GravesJohn (Tom) Thomas GravesOvernight Cybersecurity: Manafort, Gates to remain under house arrest | Mueller said to be closing in on Flynn | 'Hack back' bill gains steam | Election security gets attention from DHS 'Hack back' bill picks up new cosponsors Overnight Cybersecurity: Lawmakers grill Trump officials over Kaspersky threat | Trump camp distances itself from data firm | What we know about Bad Rabbit | Conservative groups back data privacy bill MORE, are also considering a bid.

The hardline conservative congressman has a history of making incendiary comments — just a few weeks ago he said Obama followed the "Soviet Constitution" — but since he announced his bid he has used some notable restraint in his rhetoric. It seems that only goes so far.