Miller, whose rallies grabbed national headlines for featuring gun-toting supporters, is likely to sail to victory if he wins the primary. His Democratic opponent, Sitka Mayor Scott McAdams, has $4,000 in the bank.
Even Democratic National Committee spokesman Brad Woodhouse could not recall McAdams' name when asked on "Top Line" today if national Democrats would support him.
In a press conference this afternoon, Miller, a commercial fisherman, berated Miller's negative campaign and pushed back on the idea that he should drop out for a more experienced Democratic candidate.
"I would say I am by far the most experienced candidate in this race," he said. "I believe we will beat Joe Miller."
Miller's win doesn't fundamentally alter the nature of Alaska's politics, Republicans say, but it does signal a significant shift to the right.
ABC News' Amy Miller and Z. Byron Wolf contributed to this report.