Republicans are accusing Democrats of invoking Nazis after Vice President Biden sent out a fundraising message warning of the looming “GOP blitzkrieg” of dirty campaign tactics. The e-mail was sent via the Democratic Congressional Campaign Committee. In it, Biden warned that House Democrats would “be hit with a GOP blitzkrieg of vicious Swift-Boat-style attack ads, Karl Rove-inspired knockout tactics, thinly veiled attempts at character assassination and Tea Party disruptions.” Republicans took exception at the characterization, given that “blitzkrieg” was a term to describe Germany’s military offensives during World War II. A spokesman for House Minority Leader John Boehner told The New York Daily News that “invoking the Nazis’ crimes against humanity in a political debate is simply inappropriate.” Invoking Nazism and the Holocaust has become a common rhetorical war-fighting tactic since last summer’s health care debate.