Republican Sen. Rob Portman's reelection campaign has launched a new ad that hits his Democratic opponent for boasting about holding down the "dream job" of supporting Obamacare at a left-leaning think tank in Washington, D.C.

Portman has hit former Ohio Gov. Ted Strickland for the job he did while governor. But his new ad notes that Strickland has been president of the Center for American Progress Action Fund, a liberal group led by John Podesta, the campaign chairman of Democratic presidential candidate Hillary Clinton.

The new ad twice features Strickland citing his role at CAP as a "dream job" that "paid me more money than I've ever made in my life."

"Strickland's dream job is working in Washington, D.C., with a liberal special interest group that supports Obamacare, higher taxes, job killing regulations, and the war on coal," the ad's narrator said.

The ad was produced by FP1 Strategies, a firm whose founders include former Florida Gov. Jeb Bush's campaign manager Danny Diaz. The digital ad blitz is aimed at independent voters statewide in Ohio.

Strickland has performed well in early polls, while Portman's fundraising numbers and cash-on-hand give him an edge financially. Portman previously served as the National Republican Senatorial Committee's vice chairman for finance.

Ohio's Senate race could be crucial to Republicans' hopes to maintain control of the U.S. Senate and may impact the battleground state electorate's thinking about who to pick for president.