An expensive Democratic civil war is brewing this election cycle, with a staggering 30 House Democrats facing at least one primary challenger who has raised $100,000 or more, an Axios analysis found.Why it matters: These primaries are drawing tens of millions of dollars from Democrats' efforts to retake the House while priming House Minority Leader Hakeem Jeffries (D-N.Y.) to inherit a rebellious class of new freshmen.The collective fundraising in these races adds up to more than $64 million — o...