Ohio Lt. Gov. Lee Fisher has opened up a double-digit lead over Ohio Secretary of State Jennifer Brunner ahead of next week’s Democratic Senate primary, according to a Quinnipiac University poll conducted April 22-26.

Of the 987 likely primary voters surveyed, 41 percent backed Fisher and 24 percent chose Brunner. Most of the rest said they weren’t sure. Earlier polls had Fisher leading more modestly.

The poll was in the field as Ohioans were seeing a lot of Fisher on their televisions.

Fisher spent $900,000 in early April for a statewide television campaign. Brunner’s campaign is too lightly funded to run a traditional media campaign.

Fisher has been racking up some newspaper endorsements, and he’s the preferred candidate of the Democratic Senatorial Campaign Committee.

Fisher hasn’t closed the deal just yet, though. According to the poll, 51 percent who identified a preferred candidate said they could change their mind.

The Democratic winner on Tuesday will face former Rep. Rob Portman, who is unopposed in the Republican primary for the seat being vacated by retiring Sen. George Voinovich (R).