He was the Republican nominee for Florida's 7th congressional district in the 2018 election, and lost to incumbent Democrat Stephanie Murphy.

He worked on Bill McCollum's 2004 United States Senate campaign, which was ultimately unsuccessful, as his finance director.

In 2014, Miller announced his intention to challenge the incumbent HD47 State Representative Linda Stewart, a heavily favored Democrat.

Facing environmental consultant Mo Pearson in the Republican primary, Miller prevailed with 74% of the vote and went on to beat Democrat Linda Stewart.

During his first term in the Florida House of Representatives Miller worked across the aisle to pass bills to combat veteran homelessness and cosponsored legislation to address the human trafficking crisis.