DUBUQUE, Iowa (AP) — Jeb Bush and his super PAC have put roughly three times as much money into television advertising as any of his Republican presidential rivals.

But the former Florida governor appears to have made little progress in a race that continues to be dominated by political novices like real estate mogul Donald Trump.

Bush's poll numbers are in the single digits nationally and in New Hampshire, the second-to-vote state where he has concentrated its efforts. That's about where they were when his ads began.

Still, Bush's supporters say the advertising has paid off by helping stabilize a campaign that was losing ground.

Two months before the first votes are cast, Bush is showcasing new endorsements, and his team continues to raise a steady stream of money.